Trump impeachment: Democrats announce new evidence ahead of vote
On Tuesday, they released a trove of documents relating to the allegation that Mr Trump put pressure on Ukraine to investigate a political rival.
These included text messages and handwritten notes from an associate of Rudy Giuliani, Mr Trump's lawyer.
The president denies the allegation and has branded the inquiry a "witch hunt".
Senior Democrats said they would send the fresh evidence - from Ukrainian-American businessman Lev Parnas - to the Senate alongside the formal articles of impeachment.
The House will vote on Wednesday on whether to send these articles to the Senate. As Democrats control the House, this vote is expected to pass meaning the impeachment trial can begin in earnest next week