House Minority Leader Hakeem Jeffries isn’t holding anything back about his feelings on Dr. Mehmet Oz.

During a press conference on Monday amid the ongoing government shutdown, Jeffries, 55, interjected when a reporter began a question about the Affordable Care Act with “Dr Oz said...” referring to the Trump-appointed administrator for the Centers for Medicare and Medicaid Services.

“Who?” Jeffries quipped amid scattered laughter. “That’s like the most random way to start a question on a serious topic, nobody whose serious in this country takes Dr. Oz seriously—no one,” Jeffries said.

Then, the Brooklyn lawmaker went even further. “I mean, it’s shocking that the guy was even confirmed. But this is part of the reality that Republicans here in the House and over in the Senate—they’re nothing more than a rubber stamp for Donald Trump’s cruelty and extreme agenda.”

Oz, a failed Senate candidate, was tapped by Trump to lead a sprawling agency that provides healthcare coverage to more than 160 million Americans and enforces federal standards for healthcare suppliers and providers.

The former talk show host has previously come under fire for promoting dubious weight loss products and alternative therapies on his television program, The Dr. Oz Show—something Jeffries touched on during his rant.

“I have no idea what Dr. Oz is talking about and neither do the American people,” Jeffries rambled on.

“I’m not going to respond to any comments from randos like Dr. Oz, who is woefully unqualified to be in whatever position he holds in the administration. He’s a joke, these people are a joke.”

He concluded, “But the issue of the healthcare of the American people is very serious, and that’s what we’ll continue to focus on.”

In response, Department of Health and Human Services Press Secretary Emily Hilliard wrote in a statement to the Daily Beast: “Instead of fixating on a highly qualified surgeon, professor, and author delivering real results for the American people, Representative Jeffries should focus on ending the historic government shutdown he helped create and finally do his job to reopen the government.”