He doesn't.
He doesn't care. He does what he wants, you do what you're told. Laws, regulations, constitutions don't matter. He's been like this for 40 years.
This guy is a is an elitist, country club thug pr*ck.
He will declare himself dictator, suspend Congress, eliminate the Constitution, send out the military, bash your family's faces in, scorch and destroy anyone who stands up to him, just to let you know he's the boss. He's already threatened as much.
Go ahead, sue him. It's not going to stop him. He's not going to respect the courts or anything else.
It will take the 25th Amendment to get rid of him, and he's too useful to the Dems right now to do that.