I mentioned Jon Batiste because he's writing/putting together the jazz parts of the soundtrack; presumably, TR & AR are just contributing to the background score. But who knows, maybe TR will play dat sax after all!
Yeah, there is way more than just one film production company in Hollywood that's "fine [with] supporting" Trump; it's part of the rigged game of American politics. Again, I don't begrudge the artists for making their money in any way; I just don't personally feel comfortable buying a ticket in this case.