From name-calling to online spats, Rosie O’Donnell and President Donald Trump have gone head-to-head with each other for nearly two decades.

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.

Trump’s threat to revoke Rosie O’Donnell’s citizenship shows his conditional support for free speech.