A critical disclosure by the Mueller team during its investigation – but unmentioned in both the final Mueller and Senate reports – directly contradicts the Senate’s assessment. After Mueller accused Kilimnik of having unspecified Russian intelligence "ties" in 2017, Manafort's legal team made multiple discovery requests for any communication between Manafort and "Russian intelligence officials."

In April 2018, Manafort’s attorneys revealed that the special counsel replied that "there are no materials responsive to [those] requests." The Mueller team's response marked a tacit admission that as of 2019, the FBI did not consider Kilimnik a Russian agent.