Trump attacks ‘liar’ ex-campaign aide Papadopoulos after guilty plea

President Trump sent out a series of tweets early Tuesday again denying there was any collusion with Russia and calling former campaign adviser George Papadopoulos a “proven liar.” On Monday, it was announced that Trump's former campaign chairman, Paul Manafort, had been charged with 12 counts in special counsel Robert Mueller’s Russia investigation. The Justice Department also revealed that Papadopoulos pleaded guilty in October to lying to the FBI about Russian contacts during the 2016 election.