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 TrumpTrump opens new line of impeachment attack for Democrats Bloomberg to spend 0M on anti-Trump ads in battleground states New witness claims first-hand account of Trump's push for Ukraine probes 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 EmmerGeorge Papadopoulos launches campaign to run for Katie Hill's congressional seat Shimkus says he's been asked to reconsider retirement Walden retirement adds to GOP election woes 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 BidenBloomberg to spend 0M on anti-Trump ads in battleground states New witness claims first-hand account of Trump's push for Ukraine probes Obama cautions 2020 hopefuls against going too far left MORE's son.

A growing chorus of House Democrats is pushing for an impeachment inquiry, piling pressure on Speaker Nancy PelosiNancy PelosiPelosi: Trump tweets on Yovanovitch show his 'insecurity as an imposter' On The Money: Trump asks Supreme Court to block Dem subpoena for financial records | Kudlow 'very optimistic' for new NAFTA deal | House passes Ex-Im Bank bill opposed by Trump, McConnell Overnight Defense: Ex-Ukraine ambassador offers dramatic day of testimony | Talks of 'crisis' at State Department | Trump tweets criticism of envoy during hearing | Dems warn against 'witness intimidation' | Trump defends his 'freedom of speech' 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.