Republican presidential nominee Donald Trump criticized Vice President Kamala Harris for the crisis at the U.S.-Mexico border during a town hall event on Wednesday.

The former president made these remarks while speaking with Fox News’s Sean Hannity in Pennsylvania.

“They want open borders,” Trump said of the Democratic Party. “She wants open borders. Now she’s all of a sudden said, ‘Oh, I think we’ll close the borders.’ She was the border czar, whether you like it or not, but, even if you don’t want to use that term, she was in charge of the border. It’s the worst border in the history of the world, not just here. There’s never been a country that allowed 21 million people to come in over a three-year period. There’s never been. And 21 million people, many of whom are from prisons, many of whom are murderers, and drug dealers, and child traffickers.”

During the town hall, Trump emphasized that many of the victims of Vice President Kamala Harris’ open borders policies are women who are trafficked. He underscored the human trafficking issue as a significant consequence of the border crisis under the current administration.

“They’re coming in now and they’re putting them in our Social Security accounts, and they’re putting them in Medicare,” he added. “And just one thing, if you take a look, take a look. Over the last week, I said this was going to happen. And it’s happening because these people are tougher than our criminals are, our criminals are nice people by comparison.”