As with most things in the laws of this nation, it's not that simple. Satire and artistic expression don't fall within these bounds. Neither does supposition - if it did, then Trump would be in some serious trouble for publicly questioning Obama's birth certificate.
And hoo boy, if we want to talk about telling or inferring lies to defame other people being a civil offense, Trump has a YUGE debt to pay to an ever-widening group of people. Just saying, this is a road that he does not want to go down.