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A proposed post-Brexit trade deal with the US could allow big American companies to "run riot" in the NHS, campaigners have warned.

While the terms of any agreement has also provoked fears over food safety because of a difference in standards between the US and the EU.

Donald Trump has insisted that any post-Brexit trade deal gives the US "comprehensive market access" and the removal of "unwanted barriers".

It calls for the UK to provide full market access for US drug firms and ensure that state institutions - such as the NHS - do not discriminate against American companies when purchasing goods and services.

Labour MP Jo Stevens, a supporter of the People's Vote campaign for a second referendum, said the proposed deal - which also requires the removal of restrictions on transfers of personal data - would turn the NHS into "a playpen for huge US corporate interests".

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There are also concerns about food standards of imports from the US.

American companies have long complained that European Union regulations limit American exports of food products like chlorine-washed chicken, hormone-boosted beef and genetically-modified crops.

Liberal Democrat MP Tim Farron, a supporter of the Best for Britain campaign for a new referendum, said the document exposed "duplicity" on the part of Leave campaigners.

"Only last week (Environment Secretary) Michael Gove told the National Farmers' Union that farmers would be protected by tariffs after Brexit ," said Mr Farron.

"Now it's clear that the US won't allow that in a trade deal and wants to flood us with chlorine-washed chicken and hormone-pumped beef.

"But the British people won't be force-fed low-quality products or a bad Brexit deal. That's why we need a public vote."

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There have been high profile disagreements over the issue of chlorinated chicken.

While the International Trade Secretary Liam Fox, who is in charge of negotiating post-Brexit deals, has insisted there are no health arguments against consumption - Environment Secretary has remained opposed to the process.

The 18-page document published today demands for "comprehensive market access" for US agricultural products and the swift removal of "unwarranted barriers" blocking the export of American food and drink products.

But the Government said it welcomed the publication of its negotiating objectives by the US administration.

Mr Trump's commerce secretary Wilbur Ross warned in 2017 that continued adherence to EU standards after Brexit could act as a "landmine" to UK hopes of a free trade deal with the States.

(Image: Getty Images)

The document also makes demands for the inclusion of currency matters in any agreement - which will also pose a headache for London.

In a move which could restrict British room for manoeuvre in future trade talks with countries like China, Washington is demanding a mechanism allowing the US to "take appropriate action" if the UK negotiates a free trade agreement with a "non-market country".

The negotiating objectives, published by the office of US trade representative Robert Lighthizer, represent an opening gambit in what are expected to be lengthy negotiations stretching over a number of years.

The government have insisted they won't lower standards as part of a future deal.

A spokeswoman for the Prime Minister said: “We’ve always been very clear that we will not lower food standards as part fo a future trading agreement.

"A free trade agreement with the US has always been our priority. I note that they’ve published their objectives in those talks and we will publish ours shortly.

“We welcome the fact that they have set those out. We will be in talks with them and we will publish our own shortly.”

(Image: AFP/Getty Images)

A spokesman for Liam Fox's Department for International Trade said: "Negotiating an ambitious free trade agreement with the US that maintains our high standards for businesses, workers and consumers is a priority.

"So we welcome the US Government publishing their objectives, which demonstrates their commitment to beginning talks as soon as possible.

"As part of our open and transparent approach to negotiations, we will publish our own negotiating objectives in due course."