U.S. President Donald Trump said on Friday his administration will revoke Harvard University's tax-exempt status, returning to a threat he issued against the Massachusetts school last month as part of his wider attack on elite universities.

A New York University School of Law professor on tax policy, called the news a “lawless action by the President.”

Trump is targeting Harvard "for blatantly political purposes," U.S. Sens. Elizabeth Warren and Ed Markey, D-Mass., said Friday.