WASHINGTON — Former Trump campaign chairman Paul Manafort was interviewed by the FBI twice while he was working as a political consultant for a Ukrainian political party – several years before he was named a top adviser to Donald Trump, newly filed court documents revealed. The documents filed late Monday by prosecutors in the office of special counsel Robert Mueller, who is investigating Russian meddling in the 2016 presidential campaign, show that the FBI had interviewed Manafort in March 2013 and again in July 2014.