'You can't do a damn thing!' Iran's supreme leader Ayatollah Khamenei hits back at Donald Trump after the president threatened to make him pay a 'big price' for US embassy attack

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Iran's supreme leader today hit back at the US and warned his country would not hesitate to strike after Donald Trump said Tehran would pay a 'big price' for Hezbollah's assault on the American embassy in Baghdad.

'I and the government and the nation of Iran strongly condemn this American crime,' Ayatollah Ali Khamenei said of US strikes which killed 25 members of Kataeb Hezbollah in Iraq on Sunday night.

Thousands of Hezbollah fighters attacked the US embassy in Baghdad on Tuesday in retaliation for the airstrikes - breaking down the gate and setting the entrance on fire. 

President Trump, who deployed 100 Marines to protect the site last night and sent another 750 paratroopers to the Middle East, has accused Tehran of 'orchestrating' the assault 

And on Wednesday morning the Iran-backing militia attacked the embassy for the second day in a row, forcing  the US Marines to fire tear gas at the fighters who set part of the embassy on fire again. 

Video has also emerged of one fighter telling cameras that he hopes to kill all Americans inside the embassy during the attack. He said: 'God willing if this fire reaches inside the embassy, we will not spare a single employee.' 

Hezbollah finally ended their siege this afternoon and withdrew after laying siege to the embassy for 36 hours.  

It comes after Trump last night tweeted: 'Iran will be held fully responsible for lives lost, or damage incurred, at any of our facilities. They will pay a very BIG PRICE! This is not a Warning, it is a Threat.' 

In response, Khamenei retweeted the post and said: 'That guy has tweeted that we (the United States) see Iran responsible for the events in Baghdad and we will respond to Iran.

'First of all, you can't do a damn thing! This has nothing to do with Iran. Secondly, be logical... The people of this region hate America. Why don't Americans understand this?'

Scroll down for video. 

Iran's supreme leader Ayatollah Ali Khamenei (left) has hit out at the United States in his first public comments since deadly weekend US air strikes on pro-Iran fighters in western Iraq.

In response, Khamenei retweeted Trump's post and said: 'That guy has tweeted that we (the United States) see Iran responsible for the events in Baghdad and we will respond to Iran. First of all, you can't do a damn thing! This has nothing to do with Iran. Secondly, be logical... The people of this region hate America. Why don't Americans understand this?'

A U.S. Army soldier from 1st Brigade, 25th Infantry Division, Task Force-Iraq, mans an observation post at Forward Operating Base Union III in Baghdad on Tuesday

US Marines fired tear gas at the Iran-backed militia and their supporters early on Wednesday as the siege outside the US embassy in Baghdad continued for a second day. Iraqi flags were seen being flown, as well as the yellow of Kataeb Hezbollah

A pro-Iran Hezbollah militia fighter wears a gas mask as he and another man attack the US embassy in Baghdad on New Year's Day

A picture shows the burnt entrance of the US embassy in Baghdad, where people usually go through security scanners to enter, on New Year's Day. Furious demonstrators descended on the consulate yesterday in retaliation for US air strikes that killed 25 militants of Kataeb Hezbollah on Sunday night

Donald Trump (pictured with his wife Melania at Mar A Lago on New Year's Eve) has accused Tehran of 'orchestrating' the assault on the embassy

The US embassy in Iraq yesterday after supporters and members of the Hashed al-Shaabi military network breached the outer wall of the diplomatic mission during a protest 

He later added: 'You Americans have committed crimes in Iraq, you have committed crimes in Afghanistan. You have killed people. If the Islamic republic decides to oppose or fight against a country, it will do this explicitly.

'We are strongly committed to the interests of our country... We are strongly committed to the dignity of our nation. We are strongly committed to the progress and greatness of the nation of Iran.

'Should anyone threaten these, we will confront him without any hesitation and will strike our blow.'

Trump's reinforcements were engaged early Wednesday when tear gas was fired to disperse those who had spent the night outside the main gates. Several ambulances arrived to ferry those stricken by the gas.

Many of those involved in the embassy attack are members of the Popular Mobilization Force (PMF), of which Kataeb Hezbollah is a member. The Hezbollah group in particular is backed by Iran and was blamed for last week's missile strike on Kirkuk, which killed one US contractor.  

Earlier today US soldiers fired tear gas at the protesters, several of whom were reported wounded. A cordon of Iraqi security forces that had formed around the embassy dissipated when the gas was fired.

But reinforcements from the federal police soon arrived and the brief skirmishes calmed. 

Trump said Tuesday that he would hold Iran 'fully responsible' and ordered 750 troops from the Army's 82nd Airborne Division to head to Kuwait, with another 4,000 on stand-by to head to the same Middle East outpost.

Those numbers will add to the 14,000 who have been deployed to the hostile region in the last six months. 

No U.S. casualties or evacuations were reported after the attack Tuesday by dozens of Iran-supported militiamen. U.S. Marines were sent from Kuwait to reinforce the compound. 

Under siege: US soldiers keep watch on the US embassy in Baghdad from an observation post

Cooking pots set up outside the embassy where 50 tents and a number of portable toilets have been shipped in for the long haul

Donald Trump announced that the US embassy in Baghdad is safe after some 6,000 pro-Iran militia fighters stormed the compound on Tuesday, set walls ablaze and chanted 'Death to America!' in a violent retaliation for American air strikes

In a third tweet he quipped 'The Anti-Bengahzi!' The post was an effort to distinguish his administration's response to that of the Obama administration in the 2012 attack on a diplomatic compound in Libya that left four Americans dead. The tweet, which had a spelling error, was deleted soon after 

One furious militant said yesterday: 'God willing if this fire reaches inside the embassy, we will not spare a single employee.'

This map shows the Embassy compound located along the Tigris River in Baghdad, Iraq

Smoke billowing from the embassy's entrance yesterday after it was set alight by the rioters

US Marines fired tear gas at the Iran-backed militia and their supporters early on Wednesday as the siege outside the US embassy in Baghdad continued for a second day. Iraqi flags were seen being flown, as well as the yellow of Kataeb Hezbollah

Cooking pots set up outside the embassy where 50 tents and a number of portable toilets have been shipped in for the long haul

U.S. Army soldiers from 1st Brigade, 25th Infantry Division, Task Force-Iraq, man a defensive position at Forward Operating Base Union III in Baghdad, Iraq, on Tuesday

Iraqi security forces deploy during the second day of protests at the U.S. embassy in Baghdad, Iraq on Wednesday

Iraqi security forces face off with demonstrators on Wednesday after yesterday's carnage led to 100 US Marine reinforcements being sent to the embassy

U.S. Embassy security men use stun grenades to disperse protesters and militia fighters during a protest to condemn air strikes on bases belonging to Hashd al-Shaabi (Popular Mobilization Forces, the PMF), outside the U.S. Embassy in Baghdad today

The assault on the embassy is being carried out by members of the Iran-supported Kataeb Hezbollah militia, which is separate but linked to the Lebanese Hezbollah.

It operates under the umbrella of the state-sanctioned predominantly Shiite militias known collectively as the Popular Mobilization Forces (PMF). Many are supported by Iran. 

The US says Kataeb Hezbollah is responsible for 11 attacks on US-led coalition bases in the past two months.   

Defense Secretary Mark Esper said Tuesday night that 'in response to recent events' in Iraq, and at Trump's direction, he authorized the immediate deployment of the infantry battalion from the Army's 82nd Airborne Division at Fort Bragg, North Carolina. He did not specify the soldiers' destination, but a U.S. official familiar with the decision said they will go to Kuwait.

'This deployment is an appropriate and precautionary action taken in response to increased threat levels against U.S. personnel and facilities, such as we witnessed in Baghdad today,' Esper said in a written statement.

Additional soldiers from the 82nd Airborne's quick-deployment brigade, known officially as its Immediate Response Force, were prepared to deploy, Esper said. The U.S. official, who provided unreleased details on condition of anonymity, said the full brigade of about 4,000 soldiers may deploy.

The 750 soldiers deploying immediately were in addition to 14,000 U.S. troops who had deployed to the Gulf region since May in response to concerns about Iranian aggression, including its alleged sabotage of commercial shipping in the Persian Gulf. At the time of the attack the U.S. had about 5,200 troops in Iraq, mainly to train Iraqi forces and help them combat Islamic State extremists.

A tear gas canister is lobbed back over the wall of the US embassy compound on Wednesday as hundreds gathered outside for a second day of demonstrations

Iraqi flags flutter this morning, while a man bearing the flag of Kataeb Hezbollah waves it while standing on part of the consulate building today

Demonstrators waving Iraqi flags outside the US embassy in Iraq as the siege rumbled on for a second day. Trump has squarely levelled blame at Iran for the assault on the consulate

US Embassy security men use stun grenades to disperse protesters and militia fighters during a protest to condemn air strikes on bases belonging to the PMF, outside the U.S. Embassy in Baghdad on Wednesday

Demonstrators gather outside the embassy in the Iraqi capital as green smoke from a protester's hurled canister spews across the wall

The breach of the U.S. Embassy compound in Baghdad on Tuesday was a stark demonstration that Iran can still strike at American interests despite Trump's economic pressure campaign. It also revealed growing strains between Washington and Baghdad, raising questions about the future of the U.S. military mission there.

'They will pay a very BIG PRICE! This is not a Warning, it is a Threat. Happy New Year!' Trump tweeted Tuesday afternoon, though it was unclear whether his 'threat' meant military retaliation. He thanked top Iraqi government leaders for their 'rapid response upon request.'

American airstrikes on Sunday killed 25 fighters of an Iran-backed militia in Iraq, the Kataeb Hezbollah. The U.S. said those strikes were in retaliation for last week's killing of an American contractor and the wounding of American and Iraqi troops in a rocket attack on an Iraqi military base that the U.S. blamed on the militia. The American strikes angered the Iraqi government, which called them an unjustified violation of its sovereignty.

While blaming Iran for the embassy breach, Trump also called on Iraq to protect the diplomatic mission.

'Iran killed an American contractor, wounding many,' he tweeted from his estate in Florida. 'We strongly responded, and always will. Now Iran is orchestrating an attack on the U.S. Embassy in Iraq. They will be held fully responsible. In addition, we expect Iraq to use its forces to protect the Embassy, and so notified!'

Even as Trump has argued for removing U.S. troops from Mideast conflicts, he also has singled out Iran as a malign influence in the region. After withdrawing the U.S. in 2018 from an international agreement that exchanged an easing of sanctions for curbs on Iran's nuclear program, Trump ratcheted up sanctions.

Tear gas fills the air this morning as Iran-backed militia and their supporters continued their demonstrations outside the embassy in Baghdad

Furious demonstrators fly Iraqi flags as they stage a sit-in outside the US embassy in Baghdad on day two of their siege

U.S. Embassy security men use tear gas to disperse protesters and militia fighters during a protest to condemn air strikes on bases belonging to the PMF, outside the U.S. Embassy in Baghdad on Wednesday

Furious demonstrators at the US embassy in Baghdad surrounded the complex for a second day on Wednesday after alarming scenes on Tuesday

Furious demonstrators at the US embassy in Baghdad surrounded the complex for a second day on Wednesday after alarming scenes on Tuesday

Those economic penalties, including a virtual shut-off of Iranian oil exports, are aimed at forcing Iran to negotiate a broader nuclear deal. But critics say that pressure has pushed Iranian leaders into countering with a variety of military attacks in the Gulf.

Until Sunday's U.S. airstrikes, Trump had been measured in his response to Iranian provocations. In June, he abruptly called off U.S. military strikes on Iranian targets in retaliation for the downing of an American drone.

Robert Ford, a retired U.S. diplomat who served five years in Baghdad and then became ambassador in Syria, said Iran's allies in the Iraqi parliament may be able to harness any surge in anger among Iraqis toward the United States to force U.S. troops to leave the country. Ford said Trump miscalculated by approving Sunday's airstrikes on Kataeb Hezbollah positions in Iraq and Syria - strikes that drew a public rebuke from the Iraqi government and seem to have triggered Tuesday's embassy attack.

The Department of Defense released this photo showing Marines assigned to Special Purpose Marine Air-Ground Task Force-Crisis Response-Central Command preparing to deploy from Kuwait to support the US embassy in Baghdad

'The Americans fell into the Iranian trap,' Ford said, with airstrikes that turned some Iraqi anger toward the U.S. and away from Iran and the increasingly unpopular Iranian-backed Shiite militias.

The tense situation in Baghdad appeared to upset Trump's vacation routine in Florida, where he is spending the holidays.

Trump spent just under an hour at his private golf club in West Palm Beach before returning to his Mar-a-Lago resort in nearby Palm Beach. He had spent nearly six hours at his golf club on each of the previous two days. Trump spoke with Iraqi Prime Minister Adel Abdul-Mahdi and emphasized the need for Iraq to protect Americans and their facilities in the country, said White House spokesman Hogan Gidley.

Trump is under pressure from some in Congress to take a hard-line approach to Iranian aggression, which the United States says included an unprecedented drone and missile attack on the heart of Saudi Arabia's oil industry in September. More recently, Iran-backed militias in Iraq have conducted numerous rocket attacks on bases hosting U.S. forces.

Iraqi protesters set ablaze a sentry box in front of the US embassy building in the capital Baghdad to protest against the weekend's air strikes by US planes on several bases belonging to the Hezbollah brigades near Al-Qaim

Demonstrators and members of the militia are seen in the entrance to the compound where visitors and vehicles are usually screened by security forces

Militia fighters in military garb pictured setting fire to the US embassy wall and throwing rockets over the fencing  

US soldiers fire tear gas onto protesters who broke into the compound as black smoke from fires set by the rioters billows into the air

Demonstrators wearing military fatigues and flying the white flag of the Popular Mobilization Forces, of which Kataeb Hezbollah is a member

Protesters and militia members set fire to a reception room in the US embassy during the furious protest condemning US airstrikes on Sunday 

A protester holds an Iraqi flag during a protest to condemn air strikes belonging to paramilitary forces on Tuesday. In the ambush US forces fired back with tear gas and stun grenades, wounding dozens

Sen. Tom Cotton, an Arkansas Republican and supporter of Trump's Iran policy, called the embassy breach 'yet another reckless escalation' by Iran.

Sen. Bob Menendez of New Jersey, senior Democrat on the Senate Foreign Relations Committee, blamed Iran for the episode and faulted Trump for his 'maximum pressure' campaign against Iran.

'The results so far have been more threats against international commerce, emboldened and more violent proxy attacks across the Middle East, and now, the death of an American citizen in Iraq,' Menendez said, referring to the rocket attack last week.

By early evening Tuesday, the mob had retreated from the compound but set up several tents outside for an intended sit-in. Dozens of yellow flags belonging to Iran-backed Shiite militias fluttered atop the reception area and were plastered along the embassy's concrete wall along with anti-U.S. graffiti. American Apache helicopters flew overhead and dropped flares over the area in what the U.S. military called a 'show of force.'

The embassy breach was seen by some analysts as affirming their view that it is folly for the U.S. to keep forces in Iraq after having eliminated the Islamic State group's territorial hold in the country.

A wounded protester is seen held by pro-Iran militia members as chaos unfolds outside U.S. Embassy in Baghdad on Tuesday. The protester may have been wounded by American stun gun fire or in the tumult of the demonstrations

US soldiers watch from behind a smoke screen as Iraqi protesters surround the US embassy building in the capital Baghdad. They fired warning shots, followed by stun grenades and tear gas

Protesters burned the property in front of the U.S. compound on Tuesday waving flags and banners for their specific groups in protest of the US airstrikes in Iraq on Sunday 

US embassy security personnel are seen through a glass window as protesters and militia fighters wreak havoc outside 

US soldiers could be seen inside the building filmed from the outside by furious protesters who pressed up against the glass taunting the personnel

This photo taken through a broken window shows a vandalized room in the US embassy in Baghdad after protesters breached the outer wall of the compound 

Protesters and militia fighters carry the logo of the US embassy in Baghdad during the massive protest that unfolded Tuesday

A U.S. withdrawal from Iraq is also a long-term hope of Iran, noted Paul Salem, president of the Washington-based Middle East Institute.

And it's always possible Trump would 'wake up one morning and make that decision' to pull U.S. forces out of Iraq, as he announced earlier with the U.S. military presence in neighboring Syria, Salem said. Trump's Syria decision triggered the resignation of his first defense secretary, retired Gen. Jim Mattis, but the president later amended his decision and about 1,200 U.S. troops remain in Syria.

Trump's best weapon with Iran is the one he's already using - the sanctions, said Salem. He and Ford said Trump would do best to keep resisting Iran's attempt to turn the Iran-U.S. conflict into a full-blown military one. The administration should also make a point of working with the Iraqi government to deal with the militias, Ford said.

For the president, Iran's attacks - directly and now through proxies in Iraq - have 'been working that nerve,' Salem said. 'Now they really have Trump's attention.'