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Trump rips Bloomberg's debate performance as 'stumbling, bumbling and grossly incompetent'

President TrumpDonald TrumpHarry Reid reacts to Boehner book excerpt: 'We didn't mince words' Man arrested for allegedly threatening to stab undercover Asian officer in NYC Trump says GOP will take White House in 2024 in prepared speech MORE in an early morning tweet mocked Michael BloombergMichael BloombergThe truth behind companies' 'net zero' climate commitments The strategy Biden needs to pass his infrastructure plan Bloomberg, former RNC chair Steele back Biden pick for civil rights division MORE after his rough Democratic presidential primary debate debut, calling the former New York City mayor "grossly incompetent."

"Mini Mike Bloomberg’s debate performance tonight was perhaps the worst in the history of debates, and there have been some really bad ones," Trump tweeted.

"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!" he added.

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"Worst debate performance in history!" he added in a subsequent tweet.

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Trump's remarks echoed comments at a rally in Phoenix Wednesday night while the debate was taking place.

“Now they have a new member of the crew, mini Mike,” Trump told the crowd of supporters. “We call him ‘no boxes.’”

“I hear he’s getting pounded tonight,” Trump went on. “I hear they’re pounding him.”

Bloomberg struggled to find his footing in the Democratic primary debate in Las Vegas. It was the ninth primary debate so far, and his fellow candidates' experience on the stage shone through.

Sen. Elizabeth WarrenElizabeth WarrenOn The Money: Biden .5T budget proposes major hike in social programs | GOP bashes border, policing provisions Overnight Defense: Biden proposes 3B defense budget | Criticism comes in from left and right | Pentagon moves toward new screening for extremists POW/MIA flag moved back atop White House MORE (D-Mass.) wasted no time going after Bloomberg after the debate began.

"Democrats are not going to win if we have a nominee who has a history of hiding his tax returns, of harassing women and of supporting racist policies like redlining and stop and frisk," Warren said. "Democrats take a huge risk if we just substitute one arrogant billionaire for another."

Sen. Amy KlobucharAmy KlobucharLobbying world New small business coalition to urge action on antitrust policy Bottom line MORE (D-Minn.) added later: "I don't think you look at Donald Trump and say we need someone richer than Donald Trump in the White House."

Updated at 9:16 a.m.