WASHINGTON—The House delivered two articles of impeachment against President Trump to the Senate on Wednesday, after voting to approve seven Democratic managers to prosecute the case before the Republican-controlled chamber.

House Speaker Nancy Pelosi said that she stressed litigation experience in choosing managers to handle the trial over alleged presidential abuse of power and obstruction of Congress. Senators are expected to be sworn in on Thursday, and the proceedings are scheduled to get under way in earnest on Tuesday.

...