House Judiciary Committee ranking Republican Doug Collins Douglas (Doug) Allen CollinsTrump, Biden running neck-and-neck in Georgia: poll Trump, Biden tied in Georgia: poll Loeffler paints herself as 'more conservative than Attila the Hun' in new campaign ad MORE (Ga.) is warning Chairman Jerrold Nadler Jerrold (Jerry) Lewis NadlerDemocrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-N.Y.) that the panel’s hearing on special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s report scheduled for Monday may violate decorum rules, objecting to even the hearing’s title.

In a letter sent to Nadler on Friday, the Georgia Republican argued it appears the panel is holding a “mock-impeachment inquiry” instead of conducting proper oversight.

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“In light of Monday’s hearing entitled, ‘Lessons from the Mueller Report: Presidential Obstruction and Other Crimes,’ I am compelled to remind you — and request you remind the Majority Members of the Committee — the Rules of the House prohibit Members from ‘engag[ing] in personalities’ with Members of Congress, Senators, or the President,” Collins wrote.

“This appears to be part of a strategy to turn the Committee’s oversight hearings into a mock-impeachment inquiry rather than a legitimate exercise in congressional oversight. Conducting such hearings inevitably sets this Committee on a collision course with the longstanding Rules of the House, which you have apparently alluded to as recently as this week.”

Collins said House rules call for “minimum standards of decency and decorum” on how members should conduct themselves during debate, accusing Democratic lawmakers of failing to comply with the requirement.

“Majority Members of the Committee have demonstrated they either do not understand the Rules or simply are under the mistaken belief the Rules do not apply to them,” he said.

Collins went on to say it would be unparliamentary to ridicule President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE, make personal attacks, or accuse Trump of being a liar or having committed a crime, citing examples of recent attacks on the president made by different Democrats who have referred to him as a “bigot,” a “draft-dodger” or “a misogynist.”

“Outside of impeachment proceedings — which is clearly the case here — it is out of order for a Member of Congress, in debate, to engage in personalities with the President or express an opinion, even a third-party opinion, accusing the President of a crime. The Rules are clear on this point,“ he continued.

“To be clear, the criticisms of the actions and policies of a president are an ordinary and necessary component of a healthy democracy. However, there is a well-delineated line separating appropriate discourse from conduct that is clearly out of order,” he said.

“Finally, and most timely, the title of this hearing, if read during debate, would tread alarmingly close to the prohibition against engaging in personalities against the President due to its mere suggestion the President committed ‘obstruction [of justice] and other crimes.’”

The Judiciary Committee is one of multiple House panels investigating the Mueller report and its findings.

Mueller, who finished his 2-year probe into Russia's election interference this March, did not find enough evidence to accuse the Trump campaign of conspiring with Moscow. He declined to make a determination on whether Trump obstructed justice, but outlined multiple instances of possible obstruction.

“If we had had confidence that the president clearly did not commit a crime, we would have said so,” Mueller said in his only public remarks on the subject.

House Democratic leadership has largely resisted growing calls from the left to begin impeachment proceedings against Trump, with Speaker Nancy Pelosi Nancy PelosiHoyer: House should vote on COVID-19 aid — with or without a bipartisan deal Ruth Bader Ginsburg lies in repose at Supreme Court McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE (D-Calif.) and her allies arguing instead for continued oversight investigations of the Trump White House.