Rep. Carlos Curbelo (R-Fla.) says Donald Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE is not giving his all in the battle against Hillary Clinton Hillary Diane Rodham ClintonBiden leads Trump by 36 points nationally among Latinos: poll Democratic super PAC to hit Trump in battleground states over coronavirus deaths Battle lines drawn on precedent in Supreme Court fight MORE for the presidency.

“I have no hard proof for my theory, but the relevant question is: Do people actually think that Donald Trump is trying to win?” he asked Monday on “The Fernand Amandi Show.”

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“It may be nothing, but is this the conduct of someone who’s trying to win?” Curbelo asked, as first reported by BuzzFeed. "I just don’t see it.”

Curbelo said Trump’s past ties with the Clintons cast doubt on the Republican presidential nominee’s sincerity.

“To all my passionate friends who are Trump supporters — and I understand why; there are lots of people who are angry and frustrated in this country. They really don’t like Hillary Clinton for some obvious reasons — put his recent conduct together with the fact that he’s a close friend of the Clintons. They attended his wedding; the pictures are there to prove it; Donald Trump spoke to [former President] Bill Clinton William (Bill) Jefferson ClintonBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Bill Clinton on GOP push to fill Ginsburg vacancy: Trump, McConnell 'first value is power' MORE three weeks before launching his campaign.”

Curbelo also said Trump had missed multiple opportunities to attack Democratic presidential nominee Hillary Clinton’s use of a private email server as secretary of State.

“Hillary Clinton told a pretty egregious lie claiming that [FBI] Director [James] Comey had kind of validated her conduct and said she acted truthfully and honestly,” he said. "A blatant lie.

“Mr. Trump had all sorts of diversions going on and wasn’t talking about that,” Curbelo added. "We’ve seen these new allegations, very serious, about special access given to people through the Clinton Foundation.

“Again, Mr. Trump was not focused on this. He instead, on that day or around that day, made his comment about the 'Second Amendment people.' Whether he meant it one way or not, it created a huge distraction.”

Curbelo added that he is puzzled by Trump’s insistence on campaigning in traditionally liberal states like Connecticut.

“What is any candidate, Republican or Democrat, who’s running for president of the United States after the primaries — they’ve already won their primaries — what is any candidate doing campaigning in Connecticut, a state that President Obama carried by 18 points last time and that no Republican has won since 1988?”

Curbelo replied “Oh, certainly” when asked if Trump should step aside for a replacement GOP presidential nominee.

Curbelo has repeatedly criticized Trump’s campaign, even refusing to rule out voting for Clinton last March.

The Democratic Congressional Campaign Committee includes Curbelo’s seat in its “Red to Blue” program targeting specific House districts it thinks the party can flip.

The Cook Political Report last week listed Curbelo’s chances of reelection as “even” and a “Republican toss-up."