Story highlights Trump fired Comey

Rosenstein is a newly confirmed deputy attorney general

Washington (CNN) Rod Rosenstein probably never expected to be in the spotlight so often while serving in President Donald Trump's administration.

The deputy attorney general, who's been in law enforcement for close to three decades, is back in the news after the President tweeted Friday morning that he is being investigated for his role in firing former FBI Director James Comey and seemed to accuse Rosenstein of overseeing a "witch hunt" against him.

"I am being investigated for firing the FBI Director by the man who told me to fire the FBI Director!" Trump said on Twitter, calling the probe into him a "Witch Hunt."

I am being investigated for firing the FBI Director by the man who told me to fire the FBI Director! Witch Hunt — Donald J. Trump (@realDonaldTrump) June 16, 2017

Rosenstein is at the center of Comey's departure: His memo to Attorney General Jeff Sessions is the basis that White House officials and Trump himself have used to defend Comey's dismissal, despite the FBI's ongoing investigation into the 2016 campaign and Russia's attempts to help Trump win.

"The way the director handled the conclusion of the email investigation was wrong," Rosenstein wrote, failing to acknowledge the fact Trump cheered Comey's inquiry of Clinton on during the 2016 campaign. "As a result, the FBI is unlikely to regain public and congressional trust until it has a director who understands the gravity of the mistakes and pledges never to repeat them."

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