US Health Secretary Robert F Kennedy has made a shock claim linking circumcision to autism, building on his recent controversial and unproven declaration that a common painkiller caused the condition.

At a round-table, Kennedy reasserted the unproven link between the pain reliever Tylenol and autism, and suggested people who opposed the theory were motivated by hatred for US President Donald Trump.

During a meeting with Trump and the Cabinet, the polarising Kennedy reiterated the connection, even while noting there was no medical proof to substantiate the claim. He also mistakenly described a pregnant woman's anatomy and linked autism to circumcision.

"Anybody who takes the stuff during pregnancy unless they have to is, is irresponsible," Kennedy told Trump and fellow Cabinet members.

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