There are no federal libel laws, so I am not sure what Trump is going on about, unless he wants to violate the 10th Amendment in addition to the 1st Amendment.
I have doubts he has bothered to read either...Trump let’s what ever comes into his mind come out of his mouth. I have maintained that I would vote for him if he is nominated but his supporters make it harder and harder. They really are at a new level of annoyance!!!