Trump was asked about Swift’s decision to wade into politics as he returned to Washington after a trip to Florida.
Swift announced Sunday she’s voting for Democrat Phil Bredesen for Senate, breaking her long-standing refusal to discuss anything politics.
Trump says GOP Congressman Marsha Blackburn, Bredesen’s rival, is “doing a very good job” and is a “tremendous woman.”
And he says that Swift “doesn’t know anything about her,” adding: “I like Taylor’s music about 25 percent less now, OK?”
Swift has faced criticism for not speaking about political issues despite having a global platform.
She also said she’d vote for Democrat Jim Cooper for the House.