The grown man's jab at a literal teenage girl was deeply embarrassing, but at the time Thunberg brushed Trump's pettiness right off and briefly updated her Twitter bio accordingly to read, "A teenager working on her anger management problem".
The 17-year-old's social media post is a thinly-veiled reference to his tweet last year that mocked the teenager over what he called her "anger management issues".
Thunberg and Trump do not see eye to eye.
Mimicking the tweet Trump threw at her a year ago, Thunberg tweeted that he needs to "chill" and work on his "anger management".
Almost 1.6 million Minnesotans have already cast ballots
Under Michigan law, first time voters can register anytime on or before Election Day at their local Clerk's Office . Voters will also need to sign a declaration confirming they are surrendering the ballot and voting in person.
The tweet has been liked 1.2 million times so far and re-tweeted 266,000 times.
Pelosi confident in a Biden-Harris ticket in the White House House Speaker Nancy Pelosi (D-Calif.) expressed excitement on November 6 after witnessing Democratic presidential nominee Joe Biden take the lead in key swing states. Trump has 213 electoral votes.
Now, Greta has hit back, taking this opportunity to mimic Trump's tweet back to him as he continues to battle to keep his presidency.
She also gave Mr. Trump an icy stare in a hallway as the president made his way to another event at the United Nations headquarters, the British paper recalled.
Recently, the USA under the Trump administration exited the Paris climate agreement.
The President has been voicing his outrage at the way the ballot counting is playing out and has even announced he plans to launch a legal challenge for every state won by Joe Biden.