Trump’s comments came in a tweet after the Democrats’ presidential debate on Wednesday.

Trump wrote: “Mini Mike Bloomberg’s debate performance tonight was perhaps the worst in the history of debates, and there have been some really bad ones. He was stumbling, bumbling and grossly incompetent. If this doesn’t knock him out of the race, nothing will. Not so easy to do what I did!”

Bloomberg came under fire almost immediately after the debate started.

Sen. Elizabeth Warren, D-Mass., said: “I’d like to talk about who we’re running against: A billionaire who calls women fat broads and horse-faced lesbians, and no I’m not talking about Donald Trump. I’m talking about Mayor Bloomberg. Democrats are not going to win if we have a nominee who has a history of hiding his tax returns, of harassing women.”

Bloomberg’s other rivals also confronted him during the debate for statements on minorities. He also was criticized for his backing of the controversial stop-and-frisk police practice in New York City.