“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.

President Donald Trump’s recent threat that he was considering revoking Rosie O’Donnell’s citizenship says a lot about how the president intends to govern — and it’s “terrifying,” experts say.

“Once you have American citizenship, you have a constitutional entitlement to it,” said Eugene Volokh, a UCLA law professor.