1. I said "Where does it say he doesn't have to [enforce a law] if it violates the Constitution?"
2. You pasted the 10th amendment - This says the federal government has the powers specified by the constitution and any power not mentioned are for the states unless prohibited
3. Then I asked you how this related to the president not enforcing laws he believes are unconstitutional and you said "If the "United States [government]" doesn't have the power, POTUS in his official capacity doesn't."