Rep. Chris Collins (R-N.Y.) said early Monday that Mitt Romney “is a self-serving ego-maniac” with “a chip on his shoulder.”

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“What do I know about Mitt Romney? I know that he is a self-serving ego-maniac who puts himself first, who has a chip on his shoulder, that thinks he should be president of the United States,” Collins, who serves as co-chairman of President-elect Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's House Leadership Committee, told CNN’s “New Day.”

“I mean, there's no love lost between me and Mitt Romney. I've called him a loser for the last six months, even though I supported him,” he added.

Collins said he worries that Romney, the 2012 GOP presidential nominee, “is a bit of a lone wolf” who may not go in Trump’s “direction.”

“But if President-elect Trump does, I will certainly support that decision. It's up to the president-elect to surround himself with the people that he thinks can best serve his administration,” he added. “But I have not seen in Mitt Romney the personality traits of someone who will take direction.”

Top aide Kellyanne Conway and other top Trump advisers have gone after Romney for his past opposition to Trump. Conway tweeted Sunday that “the volume & intensity of grassroots resistance to Romney is breathtaking.”

Conway also questioned Romney’s loyalty on Sunday during her appearance on CNN’s “State of the Union,” noting that the Trump camp doesn't "even know if Mitt Romney voted for Donald Trump.”

"I'm all for party unity, but I'm not sure we have to pay for that with the secretary of State position,” she added.

MSNBC reported early Monday that Trump was “furious” with Conway over those comments, with an unidentified transition aide telling the network that they are" dangerous.”