On Thursday afternoon, Thunberg tweeted, “So ridiculous. Donald must work on his Anger Management problem, then go to a good old fashioned movie with a friend! Chill Donald, Chill!”

If that sounds familiar, it’s because it’s identical to a tweet that Trump wrote about her in December 2019.

Trump quote-tweeted actress Roma Downey, who had shared Time magazine’s tweet that named Thunberg the 2019 “Person of the Year.”

People praised Thunberg’s response, saying that her tweet was both an expert use of trolling and an impressive dunk on Trump. One Twitter user called it “the best clap-back of 2020.”

The December 2019 tweet wasn’t the first time that the president made fun of the teen climate activist. In September 2019, shortly after Thunberg’s speech addressing the UN Climate Action Summit went viral, the president sarcastically tweeted it out. “She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see,” he wrote.

Despite Trump’s numerous attacks, Thunberg obviously appears to have a sense of humor about it and has not let it phase her. Besides recycling Trump’s tweet against him, Thunberg adjusted her Twitter bio in December 2019 to also make light of the incident. “A teenager working on her anger management problem. Currently chilling and watching a good old fashioned movie with a friend,” her bio said at the time.

In a November interview with The New York Times, Thunberg expressed skepticism about both candidates in the election but especially Trump. “I think we can safely say that if Trump wins it would threaten many things. But I’m not saying that Joe Biden is good or his policies are close to being enough. They are not,” she said.

Thunberg also addressed her viral glare at Trump during the UN Climate Summit. She didn’t offer an explanation and said everyone “could see for themselves.”

In the interview, Thunberg criticized media coverage of her for not speaking as much about the climate movement and referenced her clashes with Trump on Twitter. “Frankly I don’t understand why the media focuses so much on activists rather than the problem itself,” she said. “When Trump talks about me, then people talk about that conflict rather than the climate itself.”

Press contacts for Thunberg and the Trump campaign did not respond to Newsweek’s emailed requests for comment in time for publication.