Constitutionally he can’t do that though, since it requires his term to end at noon on January 20th. If there was a deadlock on certification Trump would still leave office, and we’d probably have an emergency constitutional convention to pass a amendment to fix this bug.
You think Trump cares about the constitution? He cares about Trump. We just saw over a hundred Republican congressmen vote against the results of a fair election in favor of Trump for Trump's sake. The constitution is a rhetorical tool at best for these people.