By BBC
The US Senate has adopted ground rules for President Donald Trump's impeachment trial after nearly 13 hours of rancorous debate on the first day.
Democrats sparred with White House lawyers over what would constitute a fair trial, while Republicans blocked their attempts to call new evidence. The trial is set to resume on Wednesday with arguments by Democrats, to be followed by the defence and questions.
Mr Trump is the third US president to undergo an impeachment trial. He is charged with abuse of power and obstructing the congressional inquiry. He denies wrongdoing. Mr Trump is being put on trial after being impeached last month by the Democratic-led House of Representatives. But the Senate, which is controlled by his fellow Republicans, is not expected to convict and remove him from office.
At the World Economic Forum in Davos, Switzerland, on Tuesday, Mr Trump dismissed the accusations against him as "just a hoax". What was agreed? Republicans and Democrats argued late into the night after the trial got under way on Tuesday, with proceedings finishing close to 02:00 local time (07:00 GMT) on Wednesday.
Senators have taken oaths to act as impartial jurors in a trial presided over by the US Chief Justice, John Roberts. Under the trial rules adopted, opening arguments will begin later on Wednesday, with each side being given up to 24 hours to lay out their case, over three days.
But the key issue of witnesses has still not been settled, with the debate and vote over whether they are called postponed until after each side has argued its case. Democrats want to hear from key White House aides who worked closely with Mr Trump, including acting chief of staff Mick Mulvaney and the former national security adviser, John Bolton.