President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE in a late tweet Monday night seemed to mock Swedish teen climate activist Greta Thunberg after she delivered an emotional plea to world leaders at the United Nations.

“She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!” Trump tweeted a little after 11:30 p.m.

She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see! https://t.co/1tQG6QcVKO — Donald J. Trump (@realDonaldTrump) September 24, 2019

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Earlier Monday, Thunberg gave an impassioned speech at the U.N., railing against world leaders during the General Assembly climate summit and saying that officials have “stolen my dreams, my childhood, with your empty words — and yet I’m one of the lucky ones.”

“You say you hear us, and that you understand the urgency, but no matter how sad and angry I am I do not want to believe that,” Thunberg said. “Because if you really understood the situation and still kept on failing to act you would be evil, and that I refuse to believe.”

Trump made a quick but unexpected stop at the climate event, and a video of Thunberg crossing paths with the U.S. president following her forceful speech quickly went viral across social media.

Greta Thunberg’s glare at Donald Trump is giving me the energy to get through this Monday pic.twitter.com/xdM0rdI2ln — Sam Stryker (@sbstryker) September 23, 2019

Thunberg, who arrived in the U.S. last month after crossing the Atlantic Ocean on an emissions-free sailboat, also testified before Congress last week, submitting the Intergovernmental Panel on Climate Change's Special Report on Global Warming as her testimony and urging lawmakers to “listen to the scientists.”

Thunberg’s U.N. speech was joined by hundreds of thousands of protesters in major cities across the world who participated in global climate strikes ahead of the U.N. summit.