SACRAMENTO (CBS SF) – As lawmakers at the State Capitol consider a bill that would no longer allow parents to opt out of vaccinating their children over personal beliefs, vaccination critic Robert Kennedy Jr. waded into the debate at a Sacramento appearance.

Kennedy spoke to a crowd Tuesday screening a film that claims a link between autism in children and thimerosal, an ingredient in vaccines, according to the Sacramento Bee.

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“They get the shot, that night they have a fever of a hundred and three, they go to sleep, and three months later their brain is gone,” Kennedy reportedly told the crowd. “This is a holocaust, what this is doing to our country.”

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Multiple studies have rejected any link between thimerosal and autism. Even without any link discovered, the ingredient has been removed from nearly all childhood vaccines.

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On Wednesday, a State Senate committee will decide on the bill, known as SB 277. The bill was introduced following a measles outbreak that infected more than 100 people in California and several other states.