President Trump has advised Greta Thunberg to "Chill," and suggests that the fiery activist "work on her Anger Management problem."

Thunberg, a 16-year-old Swedish environmentalist who dropped out of school to rail against everyone except China (the world's largest polluter by gross volume), was just named TIME magazine's most influential person for 2019.

So ridiculous. Greta must work on her Anger Management problem, then go to a good old fashioned movie with a friend! Chill Greta, Chill! https://t.co/M8ZtS8okzE — Donald J. Trump (@realDonaldTrump) December 12, 2019

Quickly responding to Trump's taunt, Thunberg (or her handlers) changed her Twitter bio to: "A teenager working on her anger management problem. Currently chilling and watching a good old fashioned movie with a friend."

Meanwhile, a twitter account associated with Trump's 2020 campaign, the "Trump War Room," mocked Thunberg's TIME magazine cover on Wednesday:

When it comes to keeping his promises, there's only one Person Of The Year:



✅Booming Economy

✅Record Job Creation

✅Historic Tax Cuts

✅#AmericaFirst Trade Deals

✅ISIS Destroyed

✅Building the Wall#TIMEPOY #PromisesMadePromisesKept pic.twitter.com/pe1CNB7KKz — Trump War Room (Text TRUMP to 88022) (@TrumpWarRoom) December 11, 2019

In September, Thunberg delivered a dramatic speech to the UN general assembly in which she accused world leaders of 'ruining her childhood' and her 'dreams' - exclaiming how dare you!

In response, Trump tweeted: "She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!"