Rep. Sean Duffy Sean DuffyCNN's Ana Navarro to host Biden roundtable on making 'Trump a one-term president' Bottom line McCarthy blasts Pelosi's comments on Trump's weight MORE (R-Wis.) said Wednesday that GOP presidential front-runner 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 all bluster, lacking the substance of Sen. Marco Rubio Marco Antonio RubioSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Florida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll MORE (R-Fla.), whom Duffy his backing for the nomination.

“This guy talks big and he seems strong,” Duffy said of Trump on CNN’s “New Day." "But when you ask him questions about, ‘How do we make America safe again? How do I grow our economy? How do I bring jobs back home? How do I fix healthcare?' he doesn’t have any ideas."

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Duffy argued that Rubio is the best candidate for securing a Republican White House in November’s general election.

“When you want to fix the country, you want someone who can beat 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,” he said. “It’s not Donald Trump Democrats are afraid to run against. I think they’re afraid to run against Marco because he can shatter the Democrat coalition."

Duffy said Trump as a nominee would shrink the party, but Rubio would expand the base.

“He’s going to bring over Hispanics, single white women. Democrats don’t want to run against Marco. He can beat Hillary. He can fix the country with great policy.”

Duffy dismissed Rubio’s underwhelming performance on Super Tuesday, claiming he would flip his momentum by winning Florida’s GOP presidential primary on March 15.

“Make no mistake, Marco will win his home state,” he said. "Though Marco hasn’t won a lot of states outside of Minnesota, he’s still getting delegates for the convention. As we move into Marco’s strengths in those states, those are winner-take-all states, which are only going to help him wrack up the delegates he needs to win at convention.”

Trump dominated in multiple voting contests on Tuesday, winning seven out of 11 states up for grabs. Rubio, in contrast, emerged victorious only in Minnesota, meaning he trails both Trump and Sen. Ted Cruz Rafael (Ted) Edward CruzMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (R-Texas) in delegates.