The key here is that there is no requirement that the House immediately send the articles of impeachment to the Senate. This is Speaker Nancy Pelosi’s final card to play.
So here is a modest proposal: the House should (1) vote to impeach on Wednesday, and (2) withhold sending any articles which pass to the Senate unless and until a majority of senators commit to holding an open and fair trial in accordance with the Constitution.
Speaker Pelosi could highlight Trump’s continued cover up and obstruction, while also noting that his abuse of power is a crime in progress.
She could also explicitly link the referral to Chuck Schumer’s demands for key documents and the testimony of senior White House officials, including acting White House chief of staff Mick Mulvaney; Mulvaney’s senior adviser Robert Blair; and former national security adviser John Bolton.