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None of the treatments the four US “genius” drug companies that Donald Trump claims could help Boris Johnson recover from Covid-19 are clinically tested for coronavirus or available on the market, it has emerged.

Trump said he had spoken to four companies working with the US government on Monday and had asked two of them to “contact London immediately” about assisting with the prime minister’s treatment.

Downing Street has indicated it does not wish to take up Trump’s offer of experimental drugs.

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