"He can't do this, and he shouldn't do this," Flake, a frequent critic of the White House, said in a tweet that linked to a story about Trump's remarks.

He can’t do this, and he shouldn’t do this https://t.co/f7QUQrOa2n — Jeff Flake (@JeffFlake) October 30, 2018

Trump has sparked a national debate over birthright citizenship when he suggested during an interview, which aired Tuesday, that he could unilaterally change the Constitution.

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He said in the interview with Axios that he will sign an executive order intended to end the practice of birthright citizenship.