Joe Biden is poised to wade into the so-called “sausage war” at this week’s G7 summit, where he is expected to warn Boris Johnson not to renege on the Northern Ireland Protocol when they meet for the first time.

Jake Sullivan, the President’s national security adviser, told the BBC that Biden has “deep concerns” that a UK-EU trade row could endanger peace in Northern Ireland and said that Biden will tell fellow G7 leaders that progress since the Good Friday Agreement must be protected.