Robert F. Kennedy Jr., President Trump’s pick for health secretary, is no stranger to stirring up conversations—especially around vaccines, weight-loss drugs, and the American diet. But as he heads into his confirmation hearings, there’s a lot more on the table than his well-known stances.

While Kennedy has been vocal about his skepticism of vaccines and his plans to reshape the nation’s eating habits, he’s remained quiet on other critical health issues. These include Medicare, Medicaid, and the Affordable Care Act—programs that cover over 160 million Americans.

The hearings, starting Wednesday in the Senate Finance Committee and continuing Thursday in the Senate health committee, will give lawmakers a chance to press Kennedy on these topics. Here’s a look at five key areas likely to come up:

Vaccines

Kennedy has long questioned the safety of vaccines, linking them to autism and other health issues—claims that scientists have repeatedly debunked. While he’s said he wouldn’t pull vaccines from the market, his role as health secretary could give him significant influence over vaccine programs. He’d oversee the CDC panel that reviews vaccines and could push the FDA to halt or revoke approvals.

Stay tuned as we follow how these hearings unfold and what they could mean for the future of health policy in the U.S.