Political campaigns do not need permission to use music. Copyright laws allow political candidates to use just about any song they want, as long as they're played at a stadium, arena or other venue that already has a public-performance license through a songwriters' association such as ASCAP or BMI.
Now, if Trump tried to use the same music in an advertisement, he'd be looking at a potential lawsuit.
Wrong, wrong and wrong. I used to work in this field, and Friday afternoon, we spent hours ensuring that all live TV broadcasts taking place over the weekend had rights to any music they were using. You cannot use any piece of music on broadcast TV without first securing the rights. Trump knows this but chooses to ignore it.
Bruce Springsteen told Ronnie Raygun not to use Born in the USA for his campaign, and suggested that Reagan should really listen to the lyrics of his music before appropriating them.