Robert F. Kennedy Jr.'s personal attorney previously petitioned the Food and Drug Administration to revoke its approval of a polio vaccine.

New polling shows Republicans hold an overwhelmingly positive view of Robert F

Robert F. Kennedy Jr. returned to the Hill Tuesday to make his case to Republican senators for leadership of the Dept. of Health and Human Services.

Robert F. Kennedy Jr. returned to the Hill Tuesday along with Trump's DNI pick Tulsi Gabbard to make final pitches to senators.

Robert F. Kennedy Jr. has been trying to win over skeptical senators who will be key to his confirmation to lead the Department of Health and Human Services.

Robert F. Kennedy, Jr., hit Capitol Hill Monday in a bid to bolster his chances of leading the Health and Human Services Department for President-elect Donald Trump.

Kennedy discussed his nomination on Capitol Hill on Monday after spending years questioning vaccines' safety and efficacy. President-elect Trump and Kennedy both voiced support for the polio vaccine.

Robert F. Kennedy Jr. arrived on Capitol Hill on Monday to kickstart several days of private meetings with more than two dozen senators.

Robert F. Kennedy Jr. heads to Capitol Hill Monday to meet with senators and their staff in his bid to become the nation’s next health secretary.

Dr. Todd Ellerin, the director of infectious diseases at South Shore Health, discusses President-elect Donald Trump’s pick to lead the Department of Health and Human Services.

President-elect Donald Trump’s pick to lead the Department of Health and Human Services has faced skepticism from both parties, especially for his views on vaccines.

His remarks come days before he holds confirmation meetings with GOP senators.

Robert F. Kennedy Jr., Donald Trump's pick to lead HHS, will meet with multiple senators next week to seek their support ahead of Senate confirmation hearings.

Robert F. Kennedy Jr. has vowed to crack down on food dyes and pesticides. He may run into opposition from his own party, which dislikes broad federal regulation.

Named to lead the nation’s sprawling Department of Health and Human Services, Robert F. Kennedy Jr. has big ideas for busting public health policy norms.

RFK Jr.'s controversial views have received criticism since he was picked by Donald Trump to lead HHS -- but he's also receiving support from some unexpected sources.

First an environmental lawyer, then a vaccine skeptic, ABC News’ Elizabeth Schulze reports on Donald Trump’s nomination of Robert F. Kennedy Jr. to lead the Department of Health and Human Services.

Mike Pence said choosing Robert F. Kennedy Jr. is a departure from what he framed as the Trump-Pence administration's general opposition to abortion access.

A number of groups on both sides of the political spectrum are raising concerns for President-elect Trump's choice for the Department of Health and Human Services.

Doctors are worried Robert F. Kennedy Jr. will tout anti-vaccine views after he was picked to lead the Department of Health and Human Services by Trump.

Dr. Todd Ellerin, chief of infectious disease at South Shore Health, discusses why vaccine development should continue to be protected.

With RFK Jr. nominated for Secretary of the Department of Health & Human Services, these are all the agencies, including the CDC, that he would oversee.

House Republicans had mixed reactions to Trump's announcement that he would nominate Robert F. Kennedy Jr. to be HHS secretary.

New York City Eric Adams visited "The View" Friday to give his thoughts on President-elect Donald Trump's presidency and what it will mean for the city.

Dr. Richard Besser discusses why he thinks Robert F. Kennedy Jr. would have a profound negative impact on our healthcare system.

Dr. Jennifer Nuzzo, director of Brown University’s Pandemic Center, criticizes President-elect Donald Trump's pick for Health and Human Services secretary.

Dr. Todd Ellerin, South Shore Hospital’s chief of infectious diseases, reacts to President-elect Donald Trump’s cabinet pick.

ABC News medical contributor and epidemiologist Dr. John Brownstein reacts to President-elect Donald Trump’s controversial cabinet pick.

Kennedy has advised the transition team on health related-choices, sources said.

ABC News' Linsey Davis speaks with epidemiologist and ABC News contributor Dr. John Brownstein on the medical community’s reaction to RFK Jr.’s nomination to lead HHS.

ABC News’ Linsey Davis speaks with Politico’s senior Washington correspondent, Rachael Bade, about what the nomination of vaccine skeptic and conspiracy theorist could mean for public health policy.

There were mixed reactions by House Republicans on Capitol Hill after President-elect Donald Trump announced RFK Jr. as his pick for HHS secretary.

The nomination would put Kennedy, a noted vaccine skeptic who has spread disinformation in charge of the country's health system.

A woman told the House Committee on Ethics that Rep. Matt Gaetz had sex with her when she was 17, according to sources.

President-elect Donald Trump said he has picked Robert F. Kennedy Jr., a vaccine skeptic, to lead the Department of Health and Human Services, he wrote in a social media post Thursday.

Robert F. Kennedy Jr. said earlier this week that former President Donald Trump has "promised" him "control of the public health agencies."

RFK Jr, who has spread debunked conspiracy theories about vaccines, saying former President Donald Trump promised him “control of the public health agencies.”

Robert F. Kennedy Jr., who has been advising the Trump transition team, has recommended a fellow vaccine skeptic to lead the Health and Human Services Dept., sources say.

Robert F. Kennedy Jr., the former third-party presidential candidate, claims former President Donald Trump promised him control of HHS and USDA if elected president.

Kennedy, an anti-vaccine activist, said he'd lead health agencies under Trump.

A matriarch of America's most celebrated political family, Kennedy witnessed her husband's 1968 assassination. She was hospitalized on Tuesday after suffering a stroke in her sleep.

New York Magazine placed its Washington correspondent, Olivia Nuzzi, on leave this week after an alleged relationship with RFK Jr.

The NOAA is investigating Robert F. Kennedy Jr. after the resurfacing of a decades-old incident in which Kennedy allegedly drove a dead whale’s head across state lines.

An appeals court judge has halted the start of the early voting process in North Carolina.

He wanted off swing-state ballots to avoid taking votes away from Donald Trump.

An environmental group wants NOAA to investigate whether the former presidential candidate violated the Marine Mammal Protection Act.

Former President Donald Trump added the two former Democrats to his transition team as Vice President Kamala Harris and Tim Walz prepare to tour through the swing state of Georgia.

It comes after Kennedy admitted he put dead bear cub in Central Park.

Meanwhile, Vice President Kamala Harris is back on the campaign trail for the first time since the Democratic National Convention.

Robert F. Kennedy Jr. and Tulsi Gabbard, two previous Democrats, have joined former President Donald Trump's transition team, the campaign confirmed to ABC News.