president donald trump consider add veteran washington lawyer white house counsel office deal russia-related issue people familiar matter say ty cobb white-collar defense lawyer firm hogan lovells former federal prosecutor meet trump week ago another person say white house spokeswoman lindsay walters say administration announcement time cobb respond request comment except say vacation cobb 66 represent number individuals government investigations clinton administration include former democratic national committee fundraiser john huang former white house aide david watkins trump seek senior-level lawyer join office lead white house counsel mcgahn focus various russia investigations one people say addition probe special counsel robert mueller several congressional panel investigate russia allege meddle 2016 u.s. presidential election potential collusion trump campaign moscow deny interference trump deny collusion role cobb meet trump separate legal team gather represent president personally team lead new york lawyer marc kasowitz include constitutional lawyer evangelical radio talk show host jay sekulow washington lawyer john dowd michael bowe partner kasowitz firm accord source familiar matter lawyers major firm turn join trump outside legal team cite conflict firm concern trump would listen others lawyers also turn role cobb consider william burck partner quinn emanuel emmet flood partner williams connolly turn opportunity accord people familiar matter cobb distant relative famous baseball player name graduate harvard university earn law degree georgetown 1980s federal prosecutor baltimore lead regional drug organize crime task force cobb experience leak trump repeatedly complain relation russia probe 2006 cobb represent former cia official mary mccarthy fire accuse provide classify information reporters charge bring mccarthy version story refiled add drop word paragraph four trump consider lawyer white house russia role source