Over rigorous questioning from senators Wednesday, Robert F. Kennedy Jr. laid out his vision to lead the Department Health and Human Services, while backtracking on his past statements in support of abortion and against vaccines.

Kennedy, a former independent presidential candidate, is one of President Donald Trump’s more unorthodox Cabinet picks, as his nomination has drawn skepticism from those on the left and the right.

While the most aggressive lines of inquiry during his three-and-a-half hour appearance before the Senate Finance Committee came from Democrats, Kennedy also stumbled while facing questioning from Sen. Bill Cassidy, R-La., a doctor who is expected to play a pivotal role in his confirmation, on the issue of Medicaid.

Kennedy stated that Medicaid premiums and deductibles were too high, saying most people who use the program are “not happy.” But most Medicaid enrollees do not pay premiums or deductibles. Cassidy chairs the Senate Health, Education, Labor and Pensions Committee, which Kennedy will testify before on Thursday.