Taylor Swift‘s endorsement of Kamala Harris is clearly rattling Donald Trump.

The former president lashed out at the pop superstar on his Truth Social account Sunday (Sept. 15) following her recent endorsement of the vice president in the 2024 U.S. presidential election. “I HATE TAYLOR SWIFT!” Trump wrote in all caps.

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The 78-year-old businessman-turned-politician’s post follows Swift’s message in support of the Harris-Walz campaign follow last week’s first televised debate between Trump and Harris on ABC News. The “Anti-Hero” singer’s lengthy note to her 238 million Instagram followers didn’t directly attack the ex-POTUS but focused rather on encouraging her fans to research the issues and register to vote.

“I will be casting my vote for Kamala Harris and Tim Walz in the 2024 Presidential Election,” Swift wrote alongside a photo with her cat Benjamin Button. “I’m voting for @kamalaharris because she fights for the rights and causes I believe need a warrior to champion them.”

The pop star’s endorsement of Harris-Walz also called out Trump posting fake AI images that had falsely suggested she supported the MAGA leader.

“It really conjured up my fears around AI, and the dangers of spreading misinformation,” she said about the doctored images Trump put up on his Truth Social feed. “It brought me to the conclusion that I need to be very transparent about my actual plans for this election as a voter. The simplest way to combat misinformation is with the truth.”

Swift signed her Instagram post as “Childless Cat Lady,” a zinger aimed at Trump’s VP candidate JD Vance, who once used that description to demean Democratic leaders without children.

Following Trump’s disdainful Truth Social post on Sunday, Swifties came out of the woodwork on social media to show support for the superstar, including one of her biggest fans, Flavor Flav (aka “King Swiftie”). “I LOVE TAYLOR SWIFT,!!” the Public Enemy story wrote on X (formerly Twitter).

Other Swifties took the opportunity to share memes and GIFs teasing the Republican presidential nominee about his post, including a clip of Swift raising a wine glass on The Graham Norton Show in 2022. “Taylor Swift seeing Trump’s post like ‘my work here is done,’” the post’s caption on X reads Another fan shared a scene from the Mean Girls remake, writing, “Trump posting ‘I hate Taylor swift’ after his internal polling numbers dropped.”

Indeed, Swift’s endorsement post of the Democratic candidates brought around 400,000 people to the Vote.gov registration website in the following days. The singer could also continue efforts to get out the vote to hundreds of thousands of fans during her upcoming U.S. leg of The Eras Tour, which launches again on Oct.18 with three back-to-back shows at Hard Rock Stadium in Miami. From there she’ll visit New Orleans’ Caesars Superdome (Oct. 25-27) and Indianapolis’ Lucas Oil Stadium (Nov. 1-3). Swift’s worldwide Eras Tour in on track to becoming the highest-grossing global tour in history, with approximately 10 million tickets sold.