A coalition of conservative groups has filed an ethics complaint against Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) claiming that she has usurped authority from the executive branch and "weaponized" the impeachment process.

In a complaint to the Office of Congressional Ethics, 40 conservative groups led by Jenny Beth Martin of Tea Party Patriots Action wrote to the board's chairman, David Skaggs, arguing that Pelosi was carrying out an unconstitutional, partisan investigation.

The letter also argued that a vote scheduled for Thursday on a House resolution laying out the process and some procedures for impeachment was "insufficient" to dispel their worries about a partisan investigation.

"Speaker Pelosi’s conduct is an encroachment across the constitutionally-mandated separation of powers. She has no business examining or investigating the president’s legitimate exercise of his authority to determine the foreign and national security policy of the United States," the complaint stated.

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"In launching her 'official' impeachment inquiry without benefit of a vote of the full House of Representatives and without indicating anything remotely qualifying as 'treason, bribery, or other high crimes and misdemeanors' that is the subject of the inquiry, Speaker Pelosi has weaponized impeachment," the complaint continued.

"She and her Democratic colleagues are using the impeachment process as a weapon of partisan political battle, rather than as the means to defend the Constitution our Framers meant it to be," the complaint added.

In a statement to The Hill, Martin said that "the genie cannot be put back into the bottle" after Democrats began the impeachment inquiry without a formal House vote.

"Speaker Pelosi’s latest impeachment gambit — at last, a vote of the full House! -- is merely a continuation of her ongoing roughshod-running," said Martin.

"The genie cannot be put back in the bottle. All that 'evidence' that has been gathered before the casting of a single vote is tainted by the corrupt, secret process in which it was gathered. It is poisoned, and must be discarded for the sake of fairness," Martin added.

Pelosi's office did not immediately return a request for comment.

Allies of President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE have argued that the impeachment process is being conducted in an insufficiently bipartisan manner as Democrats bring in a steady stream of witnesses to testify about pressure from Trump on Ukraine to launch investigations into former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and the Democratic National Committee.