washington u.s. investigators examine money launder accusations president donald trump former campaign manager paul manafort hope push cooperate probe possible collusion trump campaign russia two source direct knowledge investigation say special counsel robert mueller team examine manafort financial real estate record new york well involvement ukrainian politics officials say 2006 2013 manafort buy three new york properties include one trump tower manhattan pay full late take mortgage former senior u.s. law enforcement official say tactic often use mean hide origin fund gain illegally reuters independent evidence manafort source also say whether mueller uncover evidence charge manafort money launder say see investigators critical get full cooperation investigation mueller team threaten criminal charge manafort could use leverage convince cooperate say one source manafort spokesman jason maloni say paul manafort cooperate witness truth disinformation put forth anonymous source leakers manafort see key figure investigation senior role campaign participation june 2016 meet include president son donald trump jr. close adviser jar kushner russian lawyer natalia veselnitskaya meet call lawyer offer damage information democratic presidential candidate hillary clinton mueller team ask white house friday preserve communications meet mueller examine contact russian officials trump associate nov. presidential election part broad investigation whether russia try sway election favor trump manafort become trump campaign manager june 2016 force resign two months late amid report business relationship kremlin-backed former ukrainian leader viktor yanukovich manafort previously work consultant pro-russia political party ukraine help support yanukovich accord financial audit report new york time also owe 17 million russian shell company former southern district new york u.s. attorney preet bharara investigate manafort real estate deal fire trump march mueller assume control investigation one source say bharara available comment investigation friday u.s. investigators seek turn manafort russia probe source