President Trump on Wednesday insisted that birthright citizenship “will be ended one way or the other,” opening the door for congressional action one day after House Speaker Paul Ryan said that doing so by executive action was unconstitutional.

“So-called Birthright Citizenship, which costs our Country billions of dollars and is very unfair to our citizens, will be ended one way or the other. It is not covered by the 14th Amendment because of the words ‘subject to the jurisdiction thereof.’ Many legal scholars agree…..” Trump wrote on Twitter Wednesday morning.