More than 200 former Justice Department officials have signed onto a letter expressing support for 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 and Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE amid speculation that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE could soon move to dismiss them.

"Many of us served with Robert Mueller and Rod Rosenstein," the letter reads. "Those of us who served with these men know them to be dedicated public servants committed to these principles."

The letter, signed by former Justice Department officials who served under presidents ranging from John F. Kennedy to Trump, also voices concern with Trump's attacks on federal law enforcement officials.

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"Not only is it an insult to their public service, but any attempt to corrupt or undermine the even-handed application of the rule of law threatens the foundation of our Republic," the letter reads.

As of Saturday afternoon, the letter had been signed by 245 former officials.

The letter comes as speculation swirls that Trump could soon move to dismiss Rosenstein, who is charged with overseeing the investigation into possible collusion between the Trump campaign and Russia.

Trump has also bristled at Mueller's role in the Russia investigation, and has reportedly sought, at least twice, to remove him from office.

The president bridled this week at the news that FBI agents had raided the hotel room and office of his personal attorney, Michael Cohen, calling the search a "disgrace" and an "attack on our country."

The raid was conducted after federal prosecutors in Manhattan obtained a search warrant based in part on a referral from Mueller.

Prosecutors revealed in court documents this week that Cohen has been the subject of a criminal investigation for months. The New York Times reported Friday that Trump's advisers have become increasingly worried that the corruption probe involving Cohen could pose more of a threat to Trump's presidency than the Russia investigation.