Getting sued? They can't sue him. Using their song at a rally isn't against the law, even without their permission. If he used it in an ad, that's a different story.
And Stoner, fuck you. Foo Fighters own. Go smoke another joint and space out to your Pink Floyd album.
BTW, I love Pink Floyd too, but drugs are bad.
We've discussed this already. And YES they can sue them and have a very good chance of prevailing.
Sorry. Try again.