“Because of the fact that Rosie O’Donnell is not in the best interests of our Great Country, I am giving serious consideration to taking away her Citizenship,” Trump wrote. “She is a Threat to Humanity, and should remain in the wonderful Country of Ireland, if they want her. GOD BLESS AMERICA!”

The president — who has already sought to limit birthright citizenship for the children of some immigrants — has no clear authority to do so.

"Birthright citizenship has protected us from those who might wish to pick and choose who gets to be American."