All the president has to do is assert that Supreme Court rulings about constitutionality are merely advisory and non-binding, that Marbury (1803) was wrongly decided, and that the constitutional document says absolutely nothing about the Supreme Court having this power. You don’t need a constitutional amendment. You don’t need to pass a law. And you don’t need to appoint any judges. This is a completely reasonable position that also reflects the kind of power top courts have in other countries.