House Minority Leader Nancy Pelosi, D-Calif., said Monday that the Republican tax reform push will be a political "gift" to Democrats in 2018, but still vowed her party would do all it can to defeat the bill.

"We have to save the country from this tax [bill.] Yes, it's a gift political to have them vote for raising taxes on suburban Americans to give tax breaks to the wealthiest people in America, but that's not what we're about," Pelosi said during a press conference alongside Sen. Chuck Schumer, D-N.Y. "We have to save the country from this unfair tax scam."

"In terms of America's future — if they vote for this bill, there's a political price to pay," Pelosi added. "Not because we're going to make them pay, but because their constituents are going to make them pay. The Republican leadership is asking their members to walk the plank — to walk the plank on a bill that might never become law, but has serious impact on their constituents."

She spoke days before House Republicans are expected to vote on a tax bill just before going on recess for the Thanksgiving holiday. Pelosi and Schumer brought up comments by House Speaker Paul Ryan, R-Wis. and Senate Majority Leader Mitch McConnell, R-Ky., after both had to walk back their promise that no one in the middle class would see a tax increase.

Schumer argued that Republicans are hurting their voting base with the passage of any tax bill and said it would be "catastrophic" if any version of the bills being discussed became law.

"Those admissions will be like nails on a chalkboard to voters heading into next year's midterms," Schumer said of Ryan and McConnell's remarks.

"The closer this bill gets to becoming law, the greater the threat it poses to Republican majorities in the House and Senate," Schumer said. "They are slapping around the Republican heartland, the Republican base, and they think they can get away with it, but they can't."

"The bill is a lose-lose proposition for Republicans. If they fail to pass it, they lose with their donors and the hard right," Schumer said. "If they succeed, the political fallout will be catastrophic for them."