Joe Biden has "deep" concerns that a UK-EU trade row could endanger peace in Northern Ireland, his national security adviser Jake Sullivan has told the BBC.
The US president will tell leaders at the G7 summit that gains made since the Good Friday Agreement must be protected, Mr Sullivan said.
The UK and EU are in dispute over checks on goods going between Great Britain and Northern Ireland.
If no compromise is reached, there are fears of potential violence in Northern Ireland.
President Biden will be arriving in Cornwall on Wednesday for the G7 summit, which starts on Friday – his first foreign trip since he took office.
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