washington executives facebook alphabet inc google twitter ask testify u.s. congress come weeks lawmakers probe russia allege interference 2016 u.s. election committee source say wednesday senate aide say executives three firm ask senate intelligence committee appear public hear nov. 1. leaders house representatives intelligence committee say panel would hold open hear next month representatives unnamed technology company effort good understand russia use online tool platforms sow discord influence election representatives facebook google confirm receive invitations senate committee say whether company would attend twitter immediately respond request comment house panel immediately identify company committee source say lawmakers expect hear three firm senate ask testify request late move congressional investigators gain information internet company probe extent moscow allege efforts disrupt last year u.s. election lawmakers party grow increasingly concern social network may play key role russia influence operation facebook reveal month suspect russian troll purchase 100,000 worth divisive ads platform 2016 election cycle revelation prompt call democrats new disclosure rule online political ads wednesday trump attack facebook tweet suggest world large social network collude media outlets oppose president skeptical conclusions u.s. intelligence agencies russia interfere election deny campaign collude moscow salvo prompt lengthy rebuke facebook chief executive mark zuckerberg say trump liberals upset ideas content facebook campaign run platform ideas look like zuckerberg write personal facebook page internet firm besides facebook also face rise scrutiny russia may leverage platforms twitter expect privately brief senate panel thursday republican senator jam lankford receive classify information russia interference member senate intelligence committee say wednesday country attempt sow discord u.s. domestic affairs abate russian internet troll weekend fuel debate ignite trump whether nfl players right kneel national anthem lankford say also wednesday daily beast cite unnamed source report facebook group name unite muslims america fake account link russian government use push false claim u.s. politicians include democratic presidential candidate hillary clinton group buy facebook ads reach target audiences promote political rally aim muslims website report senate house intelligence committees two main congressional panel probe allegations russia seek interfere u.s. election boost trump chance win white house possible collusion trump associate russia facebook google twitter ask testify russian meddle