Trump also threatened sanctions against Iraq and said that if U.S. troops were required to leave the country, Iraq’s government would have to pay Washington for the cost of a “very extraordinarily expensive” air base there.

He said if Iraq asked U.S. forces to leave on an unfriendly basis, “we will charge them sanctions like they’ve never seen before ever. It’ll make Iranian sanctions look somewhat tame.”

The Iraqi parliament passed a resolution calling for an end to all foreign troop presence.

An Iranian government minister denounced Trump as a “terrorist in a suit” after the U.S. president sent a series of Twitter posts on Saturday threatening to hit 52 Iranian sites, including targets important to Iranian culture, if Tehran attacks Americans or U.S. assets to avenge Soleimani’s death.

Talking to reporters aboard Air Force One on the way to Washington from Florida on Sunday evening, Trump stood by those comments.

“They’re allowed to kill our people. They’re allowed to torture and maim our people. They’re allowed to use roadside bombs and blow up our people. And we’re not allowed to touch their cultural sites? It doesn’t work that way,” he said.