Donald Trump fired back yesterday at Taylor Swift for weighing in on Tennessee's hotly contested U.S. Senate race, saying the singer doesn't know anything about the Republican she attacked on Sunday. Trump didn't know about Swift's unprecedented dip into politics, but he said outside the White House that he found her music a bit less listenable because she's opposing Rep. Marsha Blackburn, a Republican who he's endorsed. Blackburn is running to succeed the retiring Tennessee Republican Sen. Bob Corker. Swift is endorsing her challenger. Trump said that Blackburn is doing a very good job in Tennessee. “She's leading now substantially, which is good. She's a tremendous woman,” he said. “I'm sure Taylor Swift has nothing, or doesn't know anything about her. And let's say that I like Taylor's music about 25 percent less now, okay?” Trump said. Swift broke with years of silence about her political views on Sunday as she attacked Blackburn in her adopted home state.