Now, their long-standing feud has escalated after Trump threatened to revoke the comedian's U.S. citizenship months after she fled to Ireland.

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.

Most recently, O’Donnell took to TikTok to announce that she'd moved from the U.S. to Ireland, as "It’s been heartbreaking to see what’s happening politically and hard for me personally as well.