I wonder if Swift will have any legal recourse to sue Trump over this.
I know this would partly fall under the concept of political speech (and as such might be protected). But she herself is not a political figure, and by posting the image suggesting Swift supports Trump, he is stating something that I am pretty sure is not true.
Even if she did, and was successful, do you think it would make one jot of difference?
President Trump would string out the case until well after the election, refuse to pay any damages and appeal indefinitely.