(Jose Luis Magana | The Associated Press, file photo) On May 23, 2018, Paul Manafort, President Donald Trump's former campaign chairman, leaves the Federal District Court after a hearing, in Washington. Special counsel Robert Mueller is accusing Manafort of lying to federal investigators in the Russia probe in breach of his plea agreement. Prosecutors say in a new court filing that after Manafort agreed to truthfully cooperate with the investigation, he “committed federal crimes” by lying about “a variety of subject matters.”