Late Show” host Stephen Colbert on Thursday said President Donald Trump “gave a whole dumb speech” this week on artificial intelligence, and played a clip of him awkwardly greeting tech leaders.

“What a group of smart ones we have in front of me today. That’s about as good as it comes up here,” the president said and gestured to his head. “The brain power. The greatest power of them all. The brain power.”

Trump then struggled with the word “luminaries,” saying “luminarieses” instead.

“Luminarieses,” Colbert repeated as the audience laughed. “Somebody’s ‘brain power’ is in low battery mode.”

He rolled a clip of Trump complaining about the term “artificial intelligence” because “I don’t like anything that’s artificial.”

Given the president’s famous love of fast food and Diet Coke, Colbert found that claim hard to swallow.

He broke out his impression of the president.

“Nothing artificial for me,” Colbert said in his Trump voice. “They harvest my dinner straight from the nugget bush, and then they milk the Diet Coke cow, OK? Gotta milk it every day or else they explode from the carbonation.”

In another clip, Trump compared the AI industry to a baby.

“We have to grow that baby and let that baby thrive,” Trump said. “We can’t stop it. We can’t stop it.”

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“Totally normal way to talk about a baby,” Colbert replied. “That’s why they sell those balloons that say, ‘It’s a boy and you can’t stop it. You can’t stop it.’”

See more in his Thursday night monologue: