We'll block trade deal if Brexit imperils open Irish border, say US politicians

Johnson-Trump plan could fall foul of Congress if Good Friday agreement is threatened

Any future US-UK trade deal would almost certainly be blocked by the US Congress if Brexit affects the Irish border and jeopardises peace in Northern Ireland, congressional leaders and diplomats have warned.

Boris Johnson has presented a trade deal with the US as a way of offsetting the economic costs of leaving the EU, and Donald Trump promised the two countries could strike "a very substantial trade agreement" that would increase trade "four or five times".