US lobby groups for agriculture and pharmaceutical firms want UK standards changed to be closer to those of the US in a post-Brexit trade deal.
The meat lobby wants the sale of growth hormone-fed beef, currently banned in the UK and EU, to be allowed in the UK.
The drugs company lobby wants changes to the NHS drugs approval process to allow it to buy more of US drugs.
They are also asking US officials - who will hold a hearing later - to seek lower tariffs on agricultural goods.
The farming groups say any deal should move away from EU standards, including rules governing genetically modified crops, antibiotics in meats, and pesticides and herbicides, such as glyphosate.
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