Trump impeachment risks bogging down early days of Biden presidency

• Trial could tie up Senate, slowing president-elect's agenda
• Republicans who backed impeachment fear for their safety

The prospect of Donald Trump facing a bitter impeachment trial in the US Senate threatens to cast a shadow over the earliest days of Joe Biden's presidency, as Washington on Thursday headed into a militarized virtual lockdown ahead of next week's inauguration.

With warnings of more violent protests being planned following the pro-Trump mob's deadly attack on the US Capitol last week, some Republican members of Congress who voted for the unprecedented second impeachment of the president fear they are in personal danger.