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 seized on a report by the Justice Department's internal watchdog on Friday to defend his firing of 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, declaring that Comey would "go down as the worst leader, by far," in the bureau's history.

"The IG Report is a total disaster for Comey, his minions and sadly, the FBI. Comey will now officially go down as the worst leader, by far, in the history of the FBI," Trump tweeted. "I did a great service to the people in firing him. Good Instincts. Christopher Wray will bring it proudly back!"

The IG Report is a total disaster for Comey, his minions and sadly, the FBI. Comey will now officially go down as the worst leader, by far, in the history of the FBI. I did a great service to the people in firing him. Good Instincts. Christopher Wray will bring it proudly back! — Donald J. Trump (@realDonaldTrump) June 15, 2018

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The president's tweet came after Justice Department Inspector General Michael Horowitz unveiled a highly anticipated report faulting Comey for "insubordinate behavior" during the FBI probe into Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE that took place in the months before the 2016 presidential election.

That report appeared to support Trump's claim that he fired Comey because of his handling of the probe into Clinton's use of a private email server during her tenure as secretary of State.

But it also found no evidence that political bias at the FBI influenced the outcome of the investigation, and did not challenge the Justice Department's decision not to charge Clinton in the case. Trump and his supporters have repeatedly claimed Clinton should have faced further consequences.

In a previous tweet on Friday morning, Trump also attacked FBI agent Peter Strzok, who spoke critically of the real estate mogul in text messages exchanged with another official during the 2016 presidential race.

The inspector general's report revealed a previously undisclosed text message from Strzok to another then-FBI official that said "we'll stop" Trump from becoming president.

"FBI Agent Peter Strzok, who headed the Clinton & Russia investigations, texted to his lover Lisa Page, in the IG Report, that 'we’ll stop' candidate Trump from becoming President," Trump tweeted. "Doesn’t get any lower than that!"