President Donald Trump doubled down Sunday on his belief that the United States military has the right to target Iranian cultural sites, dismissing concerns from the public and even from his own administration that he would be committing a war crime by doing so.

The threat comes as the president continues escalating tensions with Iran after authorizing a U.S. airstrike that killed a top Iranian general at an airport Friday in Baghdad. The assassination of Gen. Qassem Soleimani has led to fury from Iran and unhinged threats of war from Trump.

Theyre allowed to kill our people, Trump told White House reporters Sunday on Air Force One. Theyre allowed to torture and maim our people. Theyre allowed to use roadside bombs and blow up our people. And were not allowed to touch their cultural site? It doesnt work that way.

The remarks echo Trumps comments a day earlier, when he tweeted that he will attack 52 Iranian sites if the countrys government retaliates against the U.S. over Soleimanis death. The president did not say which places the U.S. might strike, but alleged that some of those sites are cultural sites. The number of sites is the same as the number of Americans held hostage during the Iranian Revolution takeover of the U.S. Embassy in Tehran in 1979.

Many responded to his tweet by reminding him that attacking cultural sites and places of worship are war crimes under international law. The U.S. is a party to the 1954 Hague Convention, a treaty on international law that protect cultural property in the event of armed conflict. Signatories adopted the treaty because damage to cultural property belonging to any people ever means damage to the cultural heritage of all mankind.

Irans foreign minister, Mohammad Javad Zarif, hit back at Trump by comparing his threats to that of terrorists who have also destroyed cultural sites.

A reminder to those hallucinating about emulating ISIS war crimes by targeting our cultural heritage: Through MILLENNIA of history, barbarians have come and ravaged our cities, razed our monuments and burnt out libraries, Zarif tweeted Sunday morning in response to Trumps initial comments. Where are they now? Were still here, & standing tall.

The U.S. was one of the biggest critics of the so-called Islamic States destruction of historical sites in Mosul, Iraq, and Palmyra, Syria, and of the Talibans destruction of the Bamiyan Buddhas in Afghanistan .

Two senior U.S. officials on Sunday told CNN that there was widespread opposition within the Trump administration to targeting cultural sites in Iran if the U.S. retaliates. Secretary of State Mike Pompeo told several Sunday shows that the U.S. will launch retaliatory strikes against Iran if attacked , but dodged questions about whether those strikes would hit cultural sites.

Well behave lawfully. Well behave inside the system, Pompeo told George Stephanopoulos on ABCs This Week.

Soleimani led Irans elite Quds Force within the Islamic Revolutionary Guards Corps , organizing Tehrans proxy high-level armed forces across the Middle East and training Shiite militias in Iraq . He was considered one of the most ruthless and powerful influences in the region, and his assassination could destabilize the Middle East.

Soleimanis death also marks a massive shift in Washingtons relationship with Iran. The countrys leaders have vowed to retaliate against the U.S. over the assassination, and Iran on Sunday officially pulled out of the 2015 nuclear deal that prevented them from amassing enough material to create an atomic weapon. Trump withdrew the U.S. from the deal in 2018 and increased sanctions on Tehran, which escalated tensions that eventually resulted in Soleimanis assassination.

The Trump administration has claimed that the airstrike on Soleimani was necessary because he was planning an imminent attack, though the White House has not made any details about the supposed attack public.

Iraqs parliament voted Sunday to expel American forces from the country in response to the U.S. airstrike on Soleimani. More than 5,000 U.S. troops are still on the ground in Iraq 17 years after the war began.

Trump said the U.S. will not leave Iraq without being paid for its military investments in the country. He then said that if soldiers do have to leave, the president would put economic sanctions on Baghdad.

We will charge them sanctions like theyve never seen before ever. Itll make Iranian sanctions look somewhat tame, he told reporters Sunday. If theres any hostility, that they do anything we think is inappropriate, we are going to put sanctions on Iraq, very big sanctions on Iraq.