After the Republican health care bill narrowly passed the House, it now heads to the Senate, where it's expected to be fiercely debated.

Some have speculated that if Republicans fail to get their ObamaCare repeal and replacement bill through the Senate, it could hurt many in the party who are up for reelection in 2018.

Rep. Sean Duffy (R-WI) is one of those lawmakers who's up for reelection in 18 months. Although he's on solid ground in his district, he has some advice for his colleagues who are in more tenuous positions.

On "The Story" tonight, Duffy said Democrats have been energized by their anti-Trump agenda, and he wants to see Republicans get energized in support of Trump's agenda and the promises he made to the American people.

"If we get health care done - which lets us get taxes done, which lets us hopefully grow the economy and put more people back to work with better jobs - that's how we actually win," Duffy said.

He said that if Republicans "deflate their base" by not following through on their promises, Democrats will "for sure" walk away with a victory in 2018.

Martha MacCallum asked Duffy about critics of the Republican bill, who have said it brings the U.S. closer to a universal, single-payer health care system.

"Democrats are taking us toward a single-payer system," Duffy argued. "Our bill actually brings us closer to choice and competition."

Watch more above.

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