Without wanting to be drawn deeply into Trump's latest bad judgment horseshit exercise, Taylor Swift could write that song, convince John Mayer to play guitar and do back-up vocals, and they could go on a reunion tour. Or not. It would be better than suing Trump.
Trump might be able to conjure up the ghost of Roy Cohn, or this SCOTUS might find an excuse for approving his latest boorishness, (they've done it before), so do the song. Do the tour.
Do I not take Taylor Swift seriously? I don't chew bubblegum.