washington wary democrats thursday challenge republicans control u.s. congress conduct credible investigation contact president donald trump associate russia process likely take months may never become public watch carefully intelligence committee investigation proceed unearth entire truth seek alternative tool structure get truth get trust must say charles schumer democratic leader senate grow number republicans show willingness buck white house accept expand congressional inquiries resignation trump national security adviser michael flynn disclosures discuss u.s. sanction russian ambassador take office trump react angrily aftermath flynn resignation blame journalists blast leak thursday dismiss grow controversy tie aid russia scam ruse perpetrate hostile news media without authority hire watergate-style special prosecutor convene special committee democrats rely republican-led senate house representatives intelligence committees demand classify document get bottom tie trump associate moscow eight years democrat white house republicans want work trump administration advance party legislative priorities repeal obamacare roll back regulations cut tax congressional republicans say would support independent investigations committee-level probe prove inadequate jurisdiction counterintelligence program fall intelligence committee undertake bipartisan investigation full confidence ... good job conduct serious inquiry say senator marco rubio republican member intelligence panel would surprise one first ones say rubio tell reporters probe could take year part u.s. intelligence agencies begin gather analyze material likely also deep partisan divisions find could ultimately release democrats republicans agree scope investigation democrats want flynn testify public hear richard burr senate intelligence committee chairman say public hear would take place appropriate democrats question burr commitment thorough investigation schumer say thursday burr work well senator mark warner top democrat intelligence committee senator ron wyden another democrat intelligence panel say would tough battle ahead partisan divide deep house many republicans like trump focus dangers pose leak white house rather aid potential tie russia rep. devin nunes republican chairman house intelligence committee question whether record flynn conversations even legal federal surveillance rule critics say republican call leak investigations may aim deflect attention possible misconduct trump aid paul ryan republican house speaker take different view tell weekly news conference thursday classify information criminal criminal investigation leak compromise national security u.s. democrats challenge republicans conduct credible russia probe