He objectively isn’t a legitimate president. Its highly suspicious he was fairly elected in the first place, but even if he was, he has violated the constitution so many times, and committed so many acts that warrant impeachment. The only reason he is still in power is because there are too many corrupt politicians in congress and supreme court. In government in general, really.

So, if he does not adhere to the rules a president must adhere to, he is not a legitimate president.