President Trump playfully slapped down Taylor Swift's endorsement of the Democrat challenging Republican Senate candidate Marsha Blackburn in Tennessee, saying Monday it made him like her music less.

"Well, Marsha Blackburn is doing a very good job in Tennessee. She’s leading now substantially, which she should," Trump told reporters at the White House, according to a pool report. "She’s a tremendous woman. I’m sure Taylor Swift doesn’t know anything about her. Let’s say that I like Taylor’s music about 25% less now, okay?"

[Opinion: Taylor Swift throws support behind Democrats: It's a love story, will voters say yes?]

Swift, who has consciously tried to stay out of politics, told her 112 million Instagram followers on Sunday she would be casting a ballot in November for Bredesen and the Democratic incumbent in Tennessee's 5th Congressional District, Rep. Jim Cooper. She also lambasted Blackburn's voting record as a Republican House lawmaker because it "appalls and terrifies" her.

Trump is no stranger to Swift's music. His wife Melania shared a video in 2014 from the backseat of their Rolls-Royce in which the businessman and their son, Barron Trump, blasted Swift's "Blank Space" in the front seat. Trump has also tweeted about the pop star in the past.

Bredesen, a former governor trying to get elected as a Democrat in a traditionally red state, broke with the majority of his party on Friday to announce he would have voted to support Supreme Court Justice Brett Kavanaugh's confirmation had he already been serving in the Senate.