Mr Kennedy’s exchanges with Democratic senators on the panel repeatedly turned to shouting, from both sides.

But some Republican senators also expressed unease with his changes to Covid-19 policies.

The Republican senators noted Mr Kennedy said US President Donald Trump deserved a Nobel Prize for the 2020 Operation Warp Speed initiative to quickly develop mRNA Covid-19 vaccines, but that he had also attacked the safety and continued use of these jabs.

“I can’t tell where you are on Operation Warp Speed,” said Republican North Carolina senator Thom Tillis.

Mr Tillis and others asked him why the director of the Centres for Disease Control and Prevention (CDC) was fired last week, less than a month into her tenure.

Mr Kennedy said she was dishonest, and that CDC leaders who left the agen

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