Top FBI official Bill Priestap to retire

A top FBI official who had a role in overseeing investigations into both Hillary ClintonHillary Diane Rodham ClintonThorny part of obstruction of justice is proving intent, that's a job for Congress Nadler: I don't understand why Mueller didn't charge Donald Trump Jr., others in Trump Tower meeting Kellyanne Conway: Mueller didn't need to use the word 'exoneration' in report MORE and the Trump campaign will retire at the end of the year.

Bill Priestap, who currently serves as assistant director of the FBI's counterintelligence division, will leave the bureau after 20 years, The Wall Street Journal reported Tuesday. 

His departure is unrelated to the 2016 investigations and the questions that have been raised about them, the Journal reported.

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The FBI said in a statement to the newspaper that Priestap “became eligible to retire and has chosen to do so after 20 years of service."

Priestap was involved in the FBI's investigation into Russian interference in the 2016 election and whether Russians colluded with the Trump campaign, and he was also part of the bureau's investigation into Clinton's use of a private email server while she was secretary of State.

When Priestap leaves the FBI, there will be no high-ranking officials who were involved in both investigations left at the bureau, according to the Journal.

President TrumpDonald John TrumpThorny part of obstruction of justice is proving intent, that's a job for Congress Obama condemns attacks in Sri Lanka as 'an attack on humanity' Schiff rips Conway's 'display of alternative facts' on Russian election interference MORE fired former FBI director James ComeyJames Brien ComeyThorny part of obstruction of justice is proving intent, that's a job for Congress Kellyanne Conway: Mueller didn't need to use the word 'exoneration' in report April Ryan slams Mike Huckabee in Twitter feud: 'Will you get into heaven? The answer is no!' MORE last year, while Deputy Director Andrew McCabeAndrew George McCabeThe Mueller report concludes it was not needed Ten post-Mueller questions that could turn the tables on Russia collusion investigators Electronic surveillance isn't spying — it's much more powerful MORE was fired in March by Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsThe Memo: Mueller's depictions will fuel Trump angst Collins: Mueller report includes 'an unflattering portrayal' of Trump Trump frustrated with aides who talked to Mueller MORE.

Counterintelligence agent Peter Strzok was fired in August after facing criticism for sending critical texts about Trump during the 2016 campaign. Priestap supervised Strzok before he was fired. 

Trump has been highly critical of the FBI and the Department of Justice while he has served as president, frequently saying that there should be further investigations into Clinton and that the Russia probe should come to an end.