Thanks for the update. So, is the band that was/is playing allowed to play some of the songs live? Now that is plagiarism. LOL!
Good question. My suspicion is that they had a right to play the songs, since they wouldn't have opened themselves up to legal problems. But I think the whole thing is implied endorsement. If Trump uses the Queen recording of "We are the Champions" then that may lead some people to believe that the group is endorsing him. If Joe's Garage Band plays "We are the Champions" then only they could be considered the ones endorsing him.