Sensible thing to do would be to fight it on the Senate floor. If the Senate votes to convict and then to disqualify from Federal office (and if Trump wants to run again), then take that to SCOTUS on the grounds that an ex-officeholder can't be impeached.
But I think Trump will beat the rap on the Senate floor pretty easily. The bad guys need 2/3rds to convict.
Convict of what? The punishment is removal from office. There can be no conviction.