Washington (CNN) If he ever enjoyed Taylor Swift's music, President Donald Trump now likes the pop star's tracks "about 25% less."

Trump struck out at Swift a day after the singer and longtime Nashville resident endorsed Democratic candidate Phil Bredesen, a former governor, over Republican Rep. Marsha Blackburn in Tennessee's Senate race.

"What'd she say?" Trump said with a smile when he was asked about Swift's comments on Tennessee politics, walking back toward reporters on the White House's South Lawn after hearing the pop star's name shouted at him.

After being told Swift announced her opposition to Blackburn and endorsed Bredesen, Trump offered quick praise for Blackburn, who he said "is doing a very good job in Tennessee."

And then he served Swift with a diss.

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