President 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. Donald Trump floated the idea of deporting American citizens convicted of crimes during a visit to a controversial migrant detention center in southern Florida. Speaking at a facility some have nicknamed “Alligator Alcatraz” due to its remote, swampy location, Trump expanded on a hardline immigration stance by suggesting that even natural-born U.S. citizens should face removal from the country if they commit certain offenses.