Kennedy, Jr., right, President Donald Trump's nominee to serve as Secretary of Health and Human Services, talks with Committee Chairman Sen. Bill Cassidy, R-La., following his testimony during a Senate Committee on Health,

Robert F. Kennedy Jr. goes before two two U.S. Senate hearings in his quest to head the nation's health department. Louisiana Sen. Bill Cassidy, a doctor, sits on both.

The health committee chairman, Sen. Bill Cassidy, R-La., also has expressed concerns about Kennedy's anti-vaccine work. A physician, Cassidy said earlier this month he “had a frank conversation” and “spoke about vaccines at length” with Kennedy. On Tuesday, Cassidy told reporters that he is still unsure if he is backing Trump’s nominee.

RFK Jr. claimed he is not “anti-vaccine” and appeared unfamiliar with key aspects of healthcare insurance programs in his confirmation hearing.

Robert F. Kennedy Jr.'s long record of questioning the safety of childhood vaccinations persisted as a flash point for him Thursday during a confirmation hearing where a key Republican quickly raised concerns about his views.

WASHINGTON — Louisiana Sen. Bill Cassidy asked Thursday that health chief nominee Robert F. Kennedy Jr. put aside his decades-old questioning of vaccinations and promote immunizations should he be con

As Robert F. Kennedy Jr. faced skeptical senators Thursday in the second day of his confirmation hearing to lead the department of Health and Human Services, Sen. Bill Cassidy confronted Kennedy about vaccines.

Louisiana Senator Bill Cassidy said the paperwork to schedule a hearing for Trump nominee Robert F. Kennedy Jr. could arrive as soon as Tuesday.

Louisiana Sen. Bill Cassidy will be at the center of the first hearing for Robert F. Kennedy Jr.’s controversial Health and Human Services Secretary nomination.

More dramatic questioning on vaccines in RFK Jr's second confirmation hearing. Bond/Simmons-Duffin/Stone/Webber

Cassidy is expected to challenge RFK Jr. on his vaccine skepticism and views on public health in today's confirmation hearing.

Here's when and where Robert F. Kennedy will get his first hearing as President Trump's nominee for secretary of Health and Human Services.