Republican presidential front-runner Donald TrumpDonald John TrumpHouse Democrat slams Donald Trump Jr. for ‘serious case of amnesia’ after testimony Skier Lindsey Vonn: I don’t want to represent Trump at Olympics Poll: 4 in 10 Republicans think senior Trump advisers had improper dealings with Russia MORE stayed mostly silent during Saturday night’s Democratic presidential debate, until he was moved to challenge a top ABC News anchor over one particularly “stupid” remark.

“[George Stephanopoulos] stupidly believes that Hillary wants to run against me because she said so,” Trump tweeted just before the two-hour debate wrapped up. "She says that so people believe it - opposite!"

Stephanopoulos, a former White House communications director under President Bill Clinton, quickly responded to the jab.

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".@realDonaldTrump See you tomorrow on @ThisWeekABC!” he tweeted, referring to ABC’s Sunday talk show, which Stephanopoulos hosts.

As to what he thought of the debate itself, Trump's only remark was to retweet a supporter who replied “LMAO” to the question “who won the #DemDebate."