Conservative lawmakers in the House are preparing to impeach Deputy Attorney General Rod Rosenstein, Politico reported Friday.

Sources told the publication that conservatives have been preparing to have Rosenstein impeached for weeks over allegations that he's held up their investigation into FBI agents who some lawmakers say are biased against President Trump.

House Freedom Caucus leaders Reps. Mark Meadows (R-N.C.) and Jim Jordan (R-Ohio) are leading the effort, and the impeachment document could be filed as soon as Monday, according to Politico.

Ben Williamson, a spokesman for Meadows, declined to rule out if it would be filed next week, Politico reported.

The news comes the same day that Rosenstein announced charges against 12 Russian intelligence officials for allegedly hacking the Democratic National Committee.

Rosenstein has long been a target for Republicans who are frustrated over special counsel Robert Mueller's probe into election meddling by Russia and possible collusion between Moscow and the Trump campaign. He is overseeing the probe after Attorney General Jeff Sessions recused himself from the Russia investigation, and some argue that he's the only person with the legal authority to fire Mueller.

The deputy attorney general testified before the House Judiciary Committee in a tense hearing last month, with Republicans grilling him over the Mueller probe.

Speculation that Trump could fire Rosenstein increased in April after the FBI raided the home and office of Trump's former personal lawyer Michael Cohen.

Trump later responded to news reports that he may fire Mueller or Rosenstein by noting that "they're still here."