“It was always told to me that you needed a constitutional amendment. Guess what? You don’t,” Trump said during an interview with Axios.

“You can definitely do it with an act of Congress. But now they’re saying I can do it just with an executive order,” the president added, before stating, incorrectly: “We’re the only country in the world where a person comes in and has a baby, and the baby is essentially a citizen of the United States … with all of those benefits.”

Most countries in the Western Hemisphere, including Mexico and Canada, have some form of birthright citizenship. 

The talk of an executive order comes as Trump has focused on using hard-line immigration rhetoric to try to drive out his base to vote in next week’s midterm election, where control of Congress hangs in the balance.

If he follows through with the executive order it would spark an intense court battle and pave the way for a showdown at the Supreme Court over the 14th Amendment, which states that all persons “born or naturalized in the United States” are “citizens of the United States and of the State wherein they reside.”

Though Trump was quickly backed up by Sen. Lindsey Graham (R-S.C.), who said he would introduce legislation to mirror an executive order, several Republican lawmakers said they did not believe Trump could amend the Constitution on his own.

Senate Judiciary Committee Chairman Chuck Grassley (R-Iowa) told an Iowa CBS station that “it seems to me it would take a constitutional amendment to change that as opposed to an executive order.”