Greta Thunberghas plenty of messages for world leaders regarding climate change, but one person she will not be sitting down with to talk shop is PresidentDonald Trump.

“I don’t understand why I would do that,” she said onTheEllen DeGeneresShowFriday. “I don’t see what I could tell him that he hasn’t already heard, and I just think it would be a waste of time, really.”

Greta Thunberg, Donald Trump

“I was stopped because suddenly he came in and security went, ‘You have to step to the side.’ And I just wondered what was going on,” Thunberg told the Scandinavian talk showSkavlan. “And then he showed up. I think I was very shocked.”

The president retweeted a video of Thunberg speaking, adding on an apparently sarcastic message.

Greta Thunberg, Ellen DeGeneres.NBC

Greta Thunberg, Ellen

“She seems like a very happy young girl looking forward to a bright and wonderful future. So nice to see!” he wrote.

During her interview withSkavlan, Thunberg said she interpreted Trump’s words as sarcastic, but said that “of course” he would write something like that.

“I mean, you can interpret it in many different ways,” she said of his tweet. “But I mean, I knew that sometime he was probably going to say something about me. It was like, it doesn’t make any difference, in a way.”

RELATED VIDEO: Greta Thunberg Speaks at the Climate Action Summit in New York

Then in October, Trump retweeted and praised a Twitter user who criticized the speech andaccused Thunberg of being an “actress.”

Thunberg previouslysent a messagethat his words had little effect on her when she briefly changed her Twitter bio to reflect his initial tweet.

“A very happy young girl looking forward to a bright and wonderful future,” it read, according to screenshots, though she has since changed it once again.

“16 year old climate and environmental activist with Asperger’s #climatestrike #fridaysforfuture,” her bio now reads.

source: people.com