Rep. Keith Ellison (Minn.), deputy chairman of the Democratic National Committee, is gearing up for battle with Republicans as they begin to draft legislation based on President Trump's tax plan.

"This is the fight of a lifetime," Ellison said Wednesday, referring to the fight over tax reform and budget cuts, at a Congressional Progressive Caucus press conference, adding that opponents of the bill "better buckle up and organize."

It’s the American peopl who defeated Obamacare repeal, and it’s gonna be the American people who defeat this tax plan. pic.twitter.com/C9IhcM1uNM — Rep. Keith Ellison (@keithellison) October 4, 2017

Ellison, who is co-chair of the Congressional Progressive Caucus, went on to warn that liberals alone could not win the fight against the plan, which he said would disproportionately benefit the wealthy.

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His comments come after the more moderate Blue Dog Coalition of Democrats unveiled their own set of tax-reform principles.

The centrist coalition shares common ground with Republicans, agreeing on issues such as the need for the tax overhaul to improve competition between businesses. However, the Blue Dogs share with more liberal Democrats that they would like to see more direct benefits to the middle class.

Trump and House Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) have both said they expect that the Republican bill will get some Democratic votes.

The Trump administration and congressional Republicans are scrambling to score a legislative victory in tax reform after the party failed to fulfill their campaign promise of repealing ObamaCare.