A well-respected FBI agent whom special counsel Robert Mueller tapped to help manage his probe into Russian interference in the 2016 election is no longer part of the team, according to a media report.

Peter Strzok, reported ABC News, is now assigned to the FBI's human resources division.

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As former chief of the counterespionage section of the FBI, Strzok is possibly best known as one of the agents overseeing the Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE email investigation last year.

He quickly pivoted from that investigation to the FBI's inquiry on Russian interference in the 2016 election and was brought aboard Mueller's team just over a month ago.

It is not known why Strzok left the independent counsel team.

The move comes as Mueller's investigation has appeared to accelerate in pace. Near the end of July, agents served the former head of the Trump campaign, Paul Manafort, with a search warrant for his Virginia home.