As questions arise over administration’s claims of an ‘imminent threat,' US president says threat was real ‘but it doesn’t really matter’; Trump reportedly approved strike in June

'Every Senator now faces a choice: to be loyal to the President or the Constitution,' speaker writes in a letter to her Democratic colleagues

Pelosi says move prompted by 'insufficient' briefing that shows administration has no 'coherent strategy'; Republican Sen. Mike Lee calls it 'worst' briefing he's received

Decision complicates proceedings for Republicans; the former national security adviser was present for key moments investigated, including meetings with Ukrainian officials

Fuming over being kept in dark on Soleimani strike, Pelosi announces bill to stop US president from taking further action against Tehran without congressional action

House Speaker Pelosi protests 'highly unusual' administration decision to classify notification; Trump threat against Iran cultural targets raises questions about legality

Democrats and Republicans 'remain at an impasse' over terms of Senate trial of President Trump, set to start in January

US House Speaker refuses to say when or whether she would send articles to the Republican-led Senate for a trial until she knows more about how impeachment will be handled

He becomes only third American president to be formally charged and will now go to Republican -controlled Senate for trial where he is likely to be acquitted

Even before legislators opened their historic session, US president fires out more than two dozen tweets proclaiming his innocence and lambasting his opponents for 'lying'