Former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE wrote in a New York Times op-ed on Wednesday that 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's "amoral" leadership is revealing Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE's "character."

"What happened to these people?" Comey asked of Barr 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. "People are complicated, so the answer is most likely complicated. But I have some idea from four months of working close to Mr. Trump and many more months of watching him shape others."

"Amoral leaders have a way of revealing the character of those around them," he wrote.

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"I think that’s at least part of what we’ve seen with Bill Barr and Rod Rosenstein," Comey added. "Accomplished people lacking inner strength can’t resist the compromises necessary to survive Mr. Trump and that adds up to something they will never recover from."

Comey's op-ed comes on the heels of the release of a letter that 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 wrote to Barr expressing frustration with how the attorney general summarized the special counsel's investigation into Russian interference in the 2016 presidential election.

Barr in March sent a summary to Congress detailing what he called the investigation's top-level findings, saying there was no collusion between Trump's 2016 campaign and the Kremlin and that obstruction of justice charges would not be brought against Trump.

On Wednesday, the attorney general defended his summary of Mueller’s report during testimony in front of the Senate Judiciary Committee.

“How could Mr. Barr go before the Senate Judiciary Committee on Wednesday and downplay President Trump’s attempt to fire Mr. Mueller before he completed his work?” Comey asked in the op-ed.

Comey, whose firing by Trump set in motion the appointment of the special counsel, also criticized Rosenstein’s resignation letter, which was submitted to Trump earlier this week.

He asked how Rosenstein could “on resigning, thank a president who relentlessly attacked both him and the Department of Justice he led for “the courtesy and humor you often display in our personal conversations”?”

Comey contrasted Barr and Rosenstein tenures in the Trump administration with that of former Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE.

Mattis resigned from his Pentagon position in December, one day after Trump announced that he would withdraw troops from Syria.

“James Mattis, the former secretary of defense, resigned over principle, a concept so alien to Mr. Trump that it took days for the president to realize what had happened, before he could start lying about the man,” Comey wrote.

“It takes character like Mr. Mattis’s to avoid the damage, because Mr. Trump eats your soul in small bites.”

Updated at 1:43 p.m.