(The Hill) – Over half of registered voters are not confident in medical information cited by Health and Human Services (HHS) Secretary Robert F. Kennedy Jr., according to a new poll.

When asked in the Quinnipiac University poll about their level of confidence “in medical information cited by Secretary of Health and Human Services Robert F. Kennedy Jr.,” 57 percent of respondents said they are “not so confident” or “not confident at all.”

Seventeen percent in the poll said they are “very confident” when it comes to medical information cited by Kennedy, 22 percent said they are “somewhat confident” and five percent are unsure or did not respond.

Republican senators have become increasingly uncomfortable over President Trump’s unusual steps into health policy, notably the president’s backing of Kennedy and his efforts to change up the children’s vaccination schedule in spite of strong skepticism from the medical community.

The president gave Kennedy, who has a history of vaccine skepticism, a notable boost via advising mothers not to give newborns several vaccines at once and warning against Tylenol use when pregnant.

Kennedy garnered a job approval rating of 33 percent in the Quinnipiac poll, with 54 percent disapproving of his job.

The Quinnipiac Poll took place from Sept. 18 to 21, featuring 1,276 respondents and plus or minus 3.3 percentage points as its margin of sampling error.