President Donald Trump's lawyers submitted a trial brief Monday calling his impeachment by the House "a dangerous perversion" of the US constitution and demanding his immediate acquittal by the Senate.
The dueling briefs provided the most extensive look yet at the arguments taken by the opposing sides, as they seek to win over not just senators but the US public.
The historic impeachment trial is set to open in earnest at 1 pm (1800 GMT) Tuesday, first with debate on what rules will govern the trial, overseen by the chief justice of the US
Supreme Court, John Roberts.