Michael Flynn said “I don’t remember” when asked by FBI agents about discussing sanctions with a Russian diplomat during Trump’s transition to office, according to a memo filed by Special Counsel Robert Mueller that gives new details about lies the former National Security Adviser told the feds.

During the 2017 interview, the agents asked Flynn if he had discouraged Russian ambassador Sergey Kislyak from retaliating against the U.S. for the Obama administration’s decision to expel Russian spies from the U.S.