Washington( CNN) Special counsel Robert Mueller said Friday that former Trump campaign chairman Paul Manafort lied about five major issues after agreeing to cooperate with attorneys, including his “contact with administration officials.”

In a heavily redacted document, Mueller also said Manafort lied about his interactions with Konstantin Kilimnik. Mueller has said Kilimnik has ties to the Russian military intelligence unit accused of hacking the Democrat, and they've previously outlined how the two men may have worked together to tamper with witnesses following Manafort's arrest last year.

The accusations by Mueller add to growing signs that the special counsel's team has a wealth of proof about bilateral relations between people close to Trump — even in the White House — and Russians during the 2016 campaign.