Ally of former VP's daughter, who has emerged as a leading Republican adversary of Trump, says her defeat will show 'how much of a stranglehold' the ex-president has on the GOP

Six Republicans back probe, but rest of party votes to torpedo formation of panel looking into deadly January 6 attack, with many lawmakers still in thrall of Trump

Pat Toomey joins Lisa Murkowski in calling for US president to step down as Democratic House Speaker Pelosi notifies colleagues to prepare for impeachment move this week

Mitch McConnell has informed senators that without unanimous consent, January 20 is likely the earliest a trial could begin, overshadowing start of Biden administration

Democrats seeking decisive, immediate action to ensure an 'unhinged' commander in chief can't cause more damage

Resolution circulated by Dems says US president betrayed trust by actions this week, 'gravely endangered' national security; Murkowski first GOP senator to call on Trump to resign

Key Republican senator opposes fresh testimony; defense attorney Dershowitz causes controversy by suggesting president is immune if he believes he acted in national interest

Revelations in forthcoming book by former national security adviser undercut key defense argument, with some in GOP now prepared to allow fresh testimonies