Boris Johnson’s plans to tear up post-Brexit arrangements for Northern Ireland have come under fierce attack from Washington, with senior congressmen on both sides of the US political divide warning the “irresponsible” move is a threat to peace in the province.

Bill hands ‘breath-taking’ powers to ministers, warns Hansard Society. / Boris Johnson’s legal justification for tearing up his agreement with the EU on post-Brexit arrangements for Northern Ireland has been branded “hopeless” by the government’s former chief lawyer.