Donald Trump continued on Tuesday to float his idea, which some legal experts say is unconstitutional, to deport U.S. citizens who commit crimes.

Speaking to the press during a tour of a migrant detention center in the Florida Everglades, the president repeated claims that there are many immigrants who are now citizens and have been committing serious crimes.

“They’re not new to our country. They’re old to our country. Many of them were born in our country. I think we ought to get them the hell out of here, too, if you want to know the truth,” he said. “So maybe that will be the next job.”