He has no choice if he wants to be sworn in as President. Nobody else has the votes. We have to have a speaker to have an inauguration. If we vote him out, and can't get a replacement, then we don't get Trump. After Trump is in, then we can Vacate the Chair!
So a powered nosedive. What causes that? With an engine failure they could glide. If they blew up in the sky, they would fall. If a wing fell off, they would spin. This nosedive seems to be faster than terminal velocity. Intentional? Malfunction?