Trump says boycotting Tesla is illegal? But is it actually the case?

I know trump says a lot of dumb things. But he is the president and lot of people voted for him so we must take him seriously. He did introduce legislation that takes legal action on business for boycotting Israel products. Can he do the same with Tesla as well? If so how is it going to take place ? What are the legal procedures? How will consumers who don't buy Tesla penalized?