Under Laurence Tribe’s scenario, the House Democrats get to “obstruct” the Senate and “abuse” their power (to borrow terms from the articles of impeachment).
I believe that the Senate need not wait for articles of impeachment to be transmitted. Senators are empowered by the constitution to begin a trial now — with or without further action by the House. Just as the House has the “sole power of impeachment,” so too the Senate has the “sole power to try all impeachments.”
Tribe and the Democratic House majority, led by Speaker Pelosi, want to have their constitutional cake and eat it too: they want Trump impeached but not acquitted. Sorry, but the Constitution does not permit that partisan, result-oriented ploy. Either Trump has been impeached and is entitled to a Senate trial; or he has not been impeached and is entitled to a clean slate.
So there are only two constitutionally viable alternatives: either Pelosi must announce that Trump has not been impeached; or the Senate must initiate a trial. Preserving the status quo indefinitely — Trump remaining impeached without having a trial — is unconstitutional and should not be tolerated by the American people.