All unrelated to the call. They are on a fishing expedition for dirt, not criminal activity, just something to smear him with.
Trump is in a no win situation with the help of the media. If he gives in, he has undermined the executive branch and the separation of powers. If he doesn't, he will be charge with obstruction, which he will win in court, but the democrats will run with as their narrative. Courts have already ruled his tax returns are off limits and it looks like Nadler and Schiff will lose on the Mueller Grand Jury documents as well. Once the cases leave the hand picked judge and get kicked to a more independent appellate court, the constitution is upheld.