Rep. Sean Duffy Sean Patrick DuffyHouse to push back at Trump on border On The Money: Shutdown Day 27 | Trump fires back at Pelosi by canceling her foreign travel | Dems blast 'petty' move | Trump also cancels delegation to Davos | House votes to disapprove of Trump lifting Russia sanction Rare bipartisanship in lame duck Congress battling the ‘WTO’ of insurance regulation MORE (R-Wis.) said Wednesday that GOP presidential front-runner Donald Trump Donald John TrumpREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails Trump urges North Korea to denuclearize ahead of summit Venezuela's Maduro says he fears 'bad' people around Trump MORE is all bluster, lacking the substance of Sen. Marco Rubio Marco Antonio RubioWhite House pleads with Senate GOP on emergency declaration Sixteen years later, let's finally heed the call of the 9/11 Commission Schumer urges GOP to reject Trump's 'destructive' national emergency 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 ClintonREAD: Cohen testimony alleges Trump knew Stone talked with WikiLeaks about DNC emails County GOP in Minnesota shares image comparing Sanders to Hitler Holder: 'Time to make the Electoral College a vestige of the past' 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 CruzCornyn less popular than Cruz in Texas: poll Trump unleashing digital juggernaut ahead of 2020 Inviting Kim Jong Un to Washington MORE (R-Texas) in delegates.