The hearings were packed to capacity with protesters and fans, while the spillover crowd hung out in hallways and overflow rooms.

WASHINGTON — Robert F. Kennedy Jr.’s anti-vaccine advocacy is outside the mainstream. His previous statements on abortion could alienate Republicans. But a new poll finds that not all of his controversial health goals are unpopular — in fact, at least one has broad support among Democrats and Republicans.

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.

Caroline Kennedy, daughter of former President John F. Kennedy, warned senators of her “predator” cousin ahead of his first confirmation hearing on Wednesday. In a letter first reported by The Washington Post, she wrote that his victims included family members and parents of sick children.

Caroline Kennedy labeled her cousin Robert F. Kennedy Jr. a "predator". Here's what other Kennedy family members have said about RFK Jr.

Robert F. Kennedy Jr. is seeking the support of the Republican-controlled Senate in his bid to become the nation’s top health official.

In a letter to senators, Caroline Kennedy etches a damning sketch of her cousin, the latest condemnation Robert F. Kennedy Jr. has received from members of his family.

Robert F. Kennedy Jr. has said vaccines are not safe. His support for abortion access has made conservatives uncomfortable. And farmers across the Midwest are nervous over his talk of banning corn syrup and pesticides from America’s food supply.

President Donald Trump has nominated Kennedy to be the secretary of the U.S. Department of Health and Human Services, which oversees the U.S. Food and Drug Administration, Medicare and Medicaid and helps enforce the Affordable Care Act commercial health insurance rules.

To watch Kennedy's confirmation hearing, viewers can look to the Senate Finance Committee website on Wednesday and the Senate Health, Education, Labor and Pension Committee website on Thursday. C-SPAN and a plethora of broadcast and cable media outlets will broadcast live what is likely to be a contentious confirmation hearing on television.

The onslaught of claims, promises and testy exchanges did not occur in a political vacuum. The whirlwind day — Day 10 of the new White House — all unfolded as Trump himself was ranting about how diversity hiring caused the tragic airplane-and-helicopter crash outside Washington’s Ronald Reagan National Airport.