Former President Donald Trump served food in a Pennsylvania McDonald’s drive-thru on Sunday after he claimed, without evidence, that Vice President Kamala Harris never worked at the fast-food restaurant while she was in college.

“It was a big part of her resume that she worked at McDonald’s — how tough a job it was,” Trump said at a McDonald’s in Feasterville, a suburb of Philadelphia, according to NBC News. “She … made the french fries, and she talked about the heat: ‘It was so tough.’ She’s never worked at McDonald’s.”

Along with serving food, Trump also dropped a few batches of french fries in the deep fryer, all while wearing a McDonald’s apron, NBC News noted. The campaign photo-op is just the latest attempt from Trump to undermine Harris, who has said that she worked at the fast-food chain when she was younger.

Harris’ campaign told several publications that she worked at a McDonald’s in Alameda, California, while she was a college student at Howard University during the summer of 1983.

In response to Trump’s claim that Harris never worked at McDonald’s, Ian Sams, a spokesperson for Harris, told NBC News, “When Trump feels desperate, all he knows how to do is lie. He can’t understand what it’s like to have a summer job because he was handed millions on a silver platter, only to blow it.”

On Sunday, Trump was asked if the minimum wage should be raised. He dodged the question and told reporters, “Well, I think this. I think these people work hard. They’re great. And I just saw something — a process that’s beautiful.”