President Donald Trump is using his Twitter account to once again attack teenage climate activist Greta Thunberg, this time to amplify a snide dismissal of her public appearances as “acting.” A user by the name of @Opinion8dKellie shared video of Thunberg’s speech, in which the teen slammed world leaders for what she said was more interested in making money than in saving the planet by reducing carbon emissions. “What an actress!” the user, @Opinion8dKellie, tweeted, adding, “I won’t be held hostage by someone who just got a learner’s permit. Sorry kiddo!” Though the tweet was written on September 23, Trump, 73, retweeted it last week. “Keep up the great work Kellie!” he wrote. He previously shared footage of her speech on Twitter, adding an apparently sarcastic message, “She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!” Regardless of internet criticism from Trump and others, Thunberg has repeatedly brushed off hateful attacks.