(NBC News) -- The House will vote Wednesday to send the articles of impeachment against President Trump to the Senate, setting the stage for a trial next week.
Senate Majority Leader Mitch McConnell says he expects to begin on Tuesday.
It's still unclear if that will include new documents and witnesses.
That will come down to a small group of Republicans who could vote with Democrats to force testimony from witnesses, including former National Security Advisor John Bolton.
The House also votes Wednesday on who will serve as managers for the trial, with committee chairs Adam Schiff and Jerry Nadler among the contenders.
The White House, meanwhile, is assembling its own team of lawyers, and President Trump has turned impeachment into a rallying cry, calling for donations to a defense fund.