The Supreme Court says that the President (if republican) can declare anything an official act and once something is an official act it is immune from prosecution. So yeah, I don’t see any “laws” stopping the commission of genocide. Trump knows it, too. The only thing stopping him is his own morality.
I'll bet he would do a lot more illegal stuff if only his morality were stopping him. He also has to think about what happens after he's out of office/dead, or if he upsets the supreme court enough that they tell him to stop. The more egregious his acts the more likely the people carrying them out will be prosecuted by outraged people after he's gone so it might be difficult to find competant people to do his dirty work.
OTOH Even if he did send immigrants and liberals to deathcamps there's no way hard core trump voters would turn on him so he never has to worry about getting removed from office through impeachment with a 2/3rds majority after the midterms.
