Republican Sen. Bill Cassidy, R-La., told Robert F. Kennedy Jr. on Thursday that he has been "struggling with your nomination" to lead the U.S. Department of Health and Human Services. Cassidy's comments came during the second hearing this week for Kennedy, President Donald… pic.twitter.com/zlLMfc2D0g

Robert F. Kennedy Jr.’s nomination to be the nation’s top health official is uncertain after a key Republican joined Democrats to raise persistent concerns over the nominee’s deep skepticism of routine childhood vaccinations that prevent deadly diseases.

Kennedy Jr., President Donald Trump's choice to be Secretary of Health and Human Services, appears before the Senate Finance Committee for his confirmation hearing at the Capitol in Washington, Wednesday,

Robert F. Kennedy Jr.'s famous name, populist stances and loyal following have earned him President Donald Trump’s support, but will that get him the votes he needs from the Republican-controlled Senate to become the nation’s top health official?

Senators pressed Robert F. Kennedy Jr. on his past vaccine and abortion remarks in the first of two days of hearings before senators vote on whether to confirm him as President Trump’s health secretary.

In a contentious confirmation hearing to be the nation’s top health official, Robert F. Kennedy Jr. struggled to answer questions about how he would reform Medicaid or Medicare, the government