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The 27-year-old says that sceptics questioning the increase in diagnoses should instead be asking: "how did all of these people spend so much of their life undiagnosed, unsupported and let down?"

Geier is a leading vaccine sceptic who was fined by the state of Maryland for practicing medicine without a medical degree or licence and prescribing dangerous treatments to autistic children.

The vaccine sceptic has also at times promoted Vitamin A as a treatment for measles, which doctors say should only be provided in certain cases under the guidance of a physician.

Trump is a known climate sceptic who has been vocal in his criticism of global climate action.

Kennedy, who leads the HHS, which oversees the FDA, is a well-known vaccine sceptic who has a history of spreading health information that scientists say is false.