washington republican representative jason chaffetz chairman committee look president donald trump decision fire fbi chief jam comey say thursday depart congress end next month know careful consideration long discussion wife julie agree time come us move part life say letter utah constituents chaffetz conservative republican first elect house representatives 2008 gain prominence head committee investigate democratic presidential candidate hillary clinton use private email server u.s. secretary state house oversight committee head one several congressional panel look aspects russia allege attempt influence u.s. presidential election addition fire comey conduct probe whether former trump national security adviser michael flynn mislead security clearance investigators russia contact chaffetz consider run u.s. senate seat past former aide tell reuters last month congressman may run governor utah 2020 though firm decision make house oversight panel chairman chaffetz depart congress june 30