“Millions of Americans who want clean air, clean water and a healthy nation have concerns about toxins in our environment and pesticides in our food,” Donald Trump said at a rally in Arizona last August.

On Thursday, Robert F Kennedy Jr, the health secretary, will preview a report into potential causes of chronic illness in children, including lack of exercise, screen time and pesticides.

The report has largely been co-ordinated by Calley Means, a wellness influencer in the Make America Healthy Again (Maha) movement and the brother of Mr Trump’s new pick for surgeon general, Dr Casey Means.

Announcing Dr Means’s nomination, the president touted her as having “amazing Maha credentials”.

The physician-turned-wellness influencer and holistic farming advocate is just one of many in Mr Trump’s orbit pushing for the phasing out of glyphosate – the world’s most common weed killer and the main ingredient in the pesticide Roundup.