Top FBI official Bill Priestap to retire

A top FBI official who had a role in overseeing investigations into both Hillary ClintonHillary Diane Rodham ClintonRonan Farrow exposes how the media protect the powerful Kamala Harris to Trump Jr.: 'You wouldn't know a joke if one raised you' Comey says he has a 'fantasy' about deleting his Twitter account after end of Trump term 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 TrumpGiuliani says he is unaware of reported federal investigation Louisiana's Democratic governor forced into runoff Lawmakers focus their ire on NBA, not China MORE fired former FBI director James ComeyJames Brien ComeyComey says he has a 'fantasy' about deleting his Twitter account after end of Trump term We need answers to questions mainstream media won't ask about Democrats Trump 'constantly' discusses using polygraphs to stem leaks: report MORE last year, while Deputy Director Andrew McCabeAndrew George McCabeBrendan Gleeson lands Trump role in CBS miniseries based on Comey memoir Judge tells DOJ to charge McCabe or drop investigation McCabe says he would 'absolutely not' cut a deal with prosecutors MORE was fired in March by Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsTrump attacks Sessions: A 'total disaster' and 'an embarrassment to the great state of Alabama' Ocasio-Cortez fires back at Washington Times after story on her 'high-dollar hairdo' Trump's tirades, taunts and threats are damaging our democracy 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.