David Cameron has pledged to put “rocket boosters” behind plans for an EU-US free trade deal.
The UK prime minister said EU and US leaders had met and all agreed the Transatlantic Trade and Investment Partnership (TTIP) “is a deal we want”.
Speaking at the G20 summit, he said arguments against TTIP were “weak” and fears over the NHS were “nonsense”.
Many opponents are concerned about TTIP giving firms power to sue governments if they are hit by policy changes.
Len McCluskey, general secretary of the Unite union, has called for the NHS to be excluded from the deal.
The EU is currently analysing responses to a consultation on a controversial element of TTIP which would allow foreign investors to go to an international tribunal for compensation if a government breaks the rules in a way that harms the company’s interests.