u.s. senate intelligence committee ask son president donald trump former national security adviser provide document testimony part panel probe russian meddle 2016 u.s. election source familiar congressional matter tell reuters michael g. flynn close aide father former u.s. army general michael flynn 58 fire trump three weeks white house job february come scrutiny foreign contact son manage father schedule accompany trip work flynn intel group consultancy include one moscow 2015 event elder flynn sit next russian president vladimir putin russia repeatedly deny conclusions u.s. intelligence agencies moscow interfere presidential campaign help republican trump hack democratic party email spread propaganda online barry coburn lawyer young flynn 34 decline comment senate committee request report early nbc news panel could issue subpoena young flynn although could invoke fifth amendment constitutional protection self-incrimination comply elder flynn also ask panel provide information testify source close flynn say turn document intelligence committees senate u.s. house representatives source familiar congressional investigation say senate committee satisfy want obtain evidence source also confirm senate panel issue subpoena former trump campaign foreign policy adviser carter page page decline committee request voluntarily turn record relate contact russians page tell reuters email tuesday cooperate everyone d.c. might want help interest help country get end witch hunt page say touch circulation dossier produce former british spy christopher steele purport link trump advisers russia senate committee seek speak steele also investigate whether collusion then-candidate trump campaign moscow officials trump deny collusion associate call fake news flynn consultancy business activities scrutiny congressional federal investigators mainly lobby work turkish businessman various congressional panel spar steele report outline russian financial personal link trump campaign associate senate press ex-trump aide 's son document russia probe source