California’s homeless programs are in violation of several existing Federal laws, including interstate/international pollution, human trafficking, and I believe several laws concerning communicable diseases. All longstanding laws long decided to be constitutional by the Supreme Court.
Many existing Federal laws regardless of SCOTUS, are unconstitutional.
If trump can show he is validly acting in accordance within Constitutional limitations as written and originally understood and intended, then he should go for it. Otherwise, he should stay away. Use the bully pulpit. Shine a light on all this unbelievably stupid CA/Newsome nonsense. But his acts should stay withing constitutional limitations.