President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE on Tuesday accused Iran of "orchestrating an attack" on the U.S. Embassy in Iraq after hundreds of protesters stormed the compound in Baghdad in a demonstration against U.S. airstrikes that killed more than 20 members of an Iranian-backed militia.

The president also called for Iraq to "use its forces to protect the Embassy."

Trump defended the decision to target the Iranian-backed militia Kataib Hezbollah with airstrikes over the weekend, saying that attacks by the militia had led to the death of an American contractor.

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"Iran killed an American contractor, wounding many. 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," Trump tweeted. "In addition, we expect Iraq to use its forces to protect the Embassy, and so notified!"

Iran killed an American contractor, wounding many. 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! — Donald J. Trump (@realDonaldTrump) December 31, 2019

The U.S. airstrikes came on Sunday after a missile attack on an Iraqi military base led to the death of an American contractor and injured several others. The strikes targeted the Kataib Hezbollah, which the U.S. accused of initiating the earlier attack, and killed 24 of its members.

Kataib Hezbollah has denied responsibility for the attack on the Iraqi military base, The New York Times noted.

Secretary of State Mike Pompeo Michael (Mike) Richard PompeoWatchdog confirms State Dept. canceled award for journalist who criticized Trump Trump's push for win with Sudan amps up pressure on Congress Putin nominated for Nobel Peace Prize MORE, Defense Secretary Mark Esper Mark EsperOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Overnight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Official: Pentagon has started 'prudent planning' for full Afghanistan withdrawal by May MORE and Joint Chiefs of Staff Chairman Mark Milley traveled to Mar-a-Lago on Sunday to brief Trump about the incident and corresponding strikes.

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Esper said the group discussed with the president what other options were available to deter "bad behavior" in the region.

The White House said in a Tuesday afternoon statement that Trump had spoken with Prime Minister Adil Abd al-Mahdi and "emphasized the need to protect United States personnel and facilities in Iraq."

Thousands of demonstrators and supporters of the militia on Tuesday demonstrated outside the embassy compound and chanted "Death to America" to express anger over the attacks. Many protesters breached the main door to the embassy and set a fire in the reception area, leading to disposal of tear gas and gunfire, The Associated Press reported.

A Kataib Hezbollah militia spokesperson told The Washington Post that the motivation behind the protest was to lay siege to the embassy and force it to shut down.

The spat marked yet another spike in tensions between Iran and the U.S. after a year marked by them.

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Trump tweeted in June that he had called off a military strike at the last moment after U.S. officials said Iran shot down an American drone.

The U.S. in September blamed Iran for an attack on Saudi oil facilities, again raising the prospect of conflict. But Trump has repeatedly tried to balance tough talk on Iran with his desire to avoid entangling the U.S. in additional foreign wars.

Updated at 2:40 p.m.