GOP campaign chief: Backing impeachment will cost House Dems their majority in 2020

The chairman of the National Republican Congressional Committee on Tuesday warned that backing the impeachment of President TrumpDonald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE will cost Democrats their House majority in the 2020 election.

"For the past three years, the socialist Democrats have been obsessed with impeaching the president and backfilling in the reason after the fact," Rep. Tom EmmerThomas (Tom) Earl EmmerHouse Democrats' campaign arm reserves .6M in ads in competitive districts The Hill's Convention Report: Trump to attack Biden at final night of convention | Speech comes amid hurricane, racial justice protests | Biden accuses Trump of 'rooting' for violence Republicans cast Trump as best choice for women MORE (R-Minn.) said in a statement.

"They have become so radicalized by their hatred of President Trump that they are willing to plunge the nation into a constitutional crisis based on secondhand gossip," he continued.

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"Make no mistake about it: backing impeachment will cost the Democrats their majority in 2020," he added.

Calls for Trump to be impeached have grown in the last few days amid allegations that Trump pressed Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe BidenJoe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE's son.

A growing chorus of House Democrats is pushing for an impeachment inquiry, piling pressure on Speaker Nancy PelosiNancy PelosiSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Trump is betting big on the suburbs, but his strategy is failing 'bigly' Trump orders flags at half-staff to honor 'trailblazer' Ginsburg MORE (D-Calif.), who has been opposed to impeachment so far.

She is set to deliver remarks on the topic at 5 p.m.

Several Democrats have raised concerns that a full embrace of impeachment could hurt more moderate caucus members who flipped districts in 2018 that Trump won in 2016.

Nearly half of the first-term Democratic lawmakers who flipped districts are now backing impeachment following reports of Trump's call with Zelensky and a whistleblower complaint that is said to be centered on that call.

Recent polls have generally shown support for impeachment in the high 30 percent to low 40 percent range. 

Democrats currently hold a 235-199 majority in the House of Representatives, and generic congressional ballots show them winning by wide margins in 2020.