If you cast your mind back to December 2019, you might remember Donald Trump tweeting about Greta Thunberg’s “anger problem”.

Well now, the teen climate activist has waited 11 months to get back at the president.

After Trump falsely claimed victory before the results of the presidential election were released, he is now threatening legal action claiming there has been fraudulent activity occurring.

Early Friday morning, Thunberg, 17, retweeted the former businessman's demand to “STOP THE COUNT”, offering him some very familiar words of advice.

“So ridiculous. Donald must work on his Anger Management problem, then go to a good old fashioned movie with a friend!” the Nobel Peace Prize nominee wrote.

“Chill Donald, Chill!”

Last year, Trump tweeted those exact words when Greta was named TIME magazine’s Person of the Year for 2019.

At the time, he was criticised for mocking a 16-year-old girl and her accomplishments.

But the best response came from Greta herself, who changed her Twitter bio to let the world know she had taken on Trump’s advice.

“A teenager working on her anger management problem. Currently chilling and watching a good old fashioned movie with a friend,” her updated profile read.

When the election polls opened earlier this week, Thunberg urged her American followers to use their vote wisely.

“Today, many of you will have the opportunity to make a choice. Your vote will affect billions of people around the world,” she wrote on her social media accounts.

“Your vote will affect countless of generations to come. Use it. Use it well. Every election is a climate election.”

This article originally appeared on Over60.