Watch as Robert F Kennedy Jr announces his candidacy for the Democratic nomination for president of the United States during a rally in Boston, Massachusetts on Wednesday 19 April.
It was reported a number of weeks ago that Mr Kennedy had filed to run for president in 2024 as a Democrat.
“If it looks like I can raise the money and mobilize enough people to win, I’ll jump in the race,” Mr Kennedy Jr tweeted last month.
“If I run, my top priority will be to end the corrupt merger between state and corporate power that has ruined our economy, shattered the middle class, polluted our landscapes and waters, poisoned our children, and robbed us of our values and freedoms. Together we can restore America’s democracy.”
Mr Kennedy, a nephew of President John F Kennedy and the son of his slain brother Robert F Kennedy, was once known most as an environmental lawyer who worked on issues such as clean water.
But over the past nearly two decades, he's become one of the leading voices of the anti-vaccine movement.
His work has been described by members of his own family and public health experts as misleading and dangerous.
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