U.S. Attorney John Durham’s review of the Russia investigation is putting increased scrutiny on former CIA Director John Brennan, searching for any undue influence he may have had during 2017’s intelligence community assessment of Russian interference.

Durham, selected by Attorney General William Barr last year to lead this inquiry, drove to Washington, D.C., in March to ensure the investigation stayed on track during the coronavirus outbreak. The top Connecticut federal prosecutor is looking into highly sensitive issues, including whether Brennan took politicized actions to pressure the rest of the intelligence community to match his conclusions about Russian President Vladimir Putin’s motivations, according to sources cited by the Wall Street Journal.