Emails show how Dr. Mehmet Oz directly promoted an anti-malaria drug for Covid to the White House.
He emailed two senior advisers, asking to push for the drug before clinical trials were complete.
The WHO later strongly recommended against it.
The emails were unveiled on Wednesday in a report from the Select House Committee on the Coronavirus Crisis.
They contain messages from Oz to senior White House advisers.
This included Jared Kushner, former President Donald Trump's son-in-law.
It also included Deborah Birx, who was the administration's coronavirus response coordinator at the time.
It was a time when the US was still finding its footing in its fight against the virus.
He was urging them to push hydroxychloroquine as a treatment for COVID-19 before clinical trials were complete.
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