Labour has accused the Conservatives of negotiating a secret trade deal with the US to open up the NHS to American pharmaceutical companies.
Jeremy Corbyn said they had obtained uncensored government documents showing talks were at a “very advanced stage”.
He said the 451 pages covered six rounds of negotiations – taking place in Washington and London – starting in July 2107 to “just a few months ago”.
Speaking at a news conference in London, the Labour leader said the papers gave the lie to Boris Johnson’s claims that the NHS would not be part of any trade talks.
“The uncensored documents leave Boris Johnson’s denials in absolute tatters,” he told a news conference in London.
“We have now got evidence that under Boris Johnson the NHS is on the table and will be up for sale.
“He tried to cover it up in a secret agenda and today it has been exposed.”