More than 400 former officials and attorneys from the Department of Justice (DOJ) have signed a letter opposing acting Attorney General Matthew Whitaker and calling for him to be replaced, saying that they are "disturbed" by his appointment.

The DOJ alumni, who say they have worked in several past administrations under presidents from both parties, note in the open letter that Whitaker hasn't been confirmed by the Senate and that he hasn't been "fully vetted" for potential conflicts of interests.

"The Attorney General is responsible for ensuring that we are a nation of laws and that every citizen and every government official — including the President himself — is equally subject to those laws," the letter reads.

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"Because of the profound responsibilities the position entails and the independence it requires, it can only be filled by someone who has been subjected to the strictest scrutiny under the process required by the Constitution," it adds.

Protect Democracy, a nonpartisan government watchdog group, was involved in organizing the letter, which was posted on Medium.

Whitaker, who was appointed by President TrumpDonald John TrumpRussia's election interference is a problem for the GOP Pence to pitch trade deal during trip to Michigan: report Iran oil minister: US made 'bad mistake' in ending sanctions waivers MORE last month after Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsTrump poised to roll back transgender health protections Trump claims Mueller didn't speak to those 'closest' to him And the winner of the Robert Mueller Sweepstakes is — Vladimir Putin MORE's ouster, has come under scrutiny for his past criticisms of special counsel Robert MuellerRobert (Bob) Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE's investigation into Russian interference in the 2016 presidential election.

Trump has long attacked Mueller and blasted the investigation as a "witch hunt," while Democrats and some Republicans have pushed for legislation to protect the special counsel probe from being shut down.

Whitaker, previously Sessions's chief of staff, has also faced questions for reportedly receiving more than $1 million from a conservative nonprofit between 2014 and 2017, with the source of that funding unclear.

The DOJ alumni in their letter also called on Trump to replace Whitaker "with the Senate-confirmed official who is next in the line of succession by operation of federal law."

The Senate confirmed Rod RosensteinRod Jay RosensteinHeavy lapses in judgment are politicizing the justice system Top Judiciary Republican reviews less-redacted Mueller report Ex-Trump lawyer: Mueller knew Trump had to call investigation a 'witch hunt' for 'political reasons' MORE as deputy attorney general last year.

"We likewise call on the Senate to insist that its Constitutional prerogative to provide advice and consent be respected," the letter adds.