Former FBI Director James ComeyJames Brien ComeyDershowitz: Trump's lawyers could force Rosenstein to recuse himself from Mueller probe New York Times defends bombshell Rosenstein report Donald Trump’s Rosenstein dilemma MORE on Thursday expressed appreciation for the FBI standing up against "weasels and liars" as debate rages over a classified memo that purports to show political bias within the Justice Department.

"All should appreciate the FBI speaking up. I wish more of our leaders would," Comey tweeted.

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The bureau has come under intense scrutiny in recent weeks as Republicans seek the release of a classified memo, compiled by GOP staff and House Intelligence Committee Chairman Devin NunesDevin Gerald NunesRussia probe accelerates political prospects for House Intel Dems Nunes: Russia probe documents should be released before election Gowdy: House Intel panel should release all transcripts from Russia probe MORE (R-Calif.), that reportedly contains allegations of surveillance program abuses during the 2016 presidential campaign.

The FBI issued a rare public statement this week saying it had “grave concerns” about the memo, adding that some information in the document was inaccurate and misleading. FBI Director Christopher Wray reportedly reiterated those concerns directly to the White House.

The FBI Agents Association on Thursday issued a statement in support of Wray as the conflicts over the memo reached a fever pitch.

Despite concerns from top officials at the Justice Department and FBI, President TrumpDonald John TrumpSunday shows preview: Trump sells U.N. reorganizing and Kavanaugh allegations dominate Ex-Trump staffer out at CNN amid “false and defamatory accusations” Democrats opposed to Pelosi lack challenger to topple her MORE is expected to allow the release of the memo, with an announcement expected Friday. 

Democrats have called for Nunes to be removed as House Intelligence chairman over the controversy. They have also authored a countermemo they say refutes many points in the GOP version, but Republicans on the Intelligence panel voted on party lines to reject its release.

Trump fired Comey as FBI director in May, an action that precipitated the appointment of special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE to investigate Russia's election interference. 

Comey has criticized the administration with varying degrees of openness since, writing on Twitter in December that he hopes "2018 brings more ethical leadership."