The removal of the agent, who also had worked on the investigation of Hillary Clinton's use of a private email server, occurred this summer. The person who discussed the matter with The Associated Press was not authorized to speak about it publicly and spoke on condition of anonymity.
Peter Carr, a spokesman for Mueller, said Mueller removed the agent, Peter Strzok, from the team "immediately upon learning of the allegations."
So far, four people have been charged as a result of Mueller's investigation. The most recent charge occurred Friday when former national security adviser Michael Flynn pleaded guilty to lying to the FBI.
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Strzok was present during Clinton's July 2016 interview with the FBI about her use of a private email server while she was secretary of state, according to an unclassified summary of the interview commonly referred to as an FBI 302 form. Several other FBI agents and officials from the Justice Department also attended.
On Saturday, the Justice Department's inspector general's office released a statement confirming that it was continuing to review unspecified allegations made about the department's and the FBI's actions "in advance of the 2016 election."
The statement didn't refer to any agents or officials by name.
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