the two leaders will agree a new atlantic charter — modelled on the statement setting out american and british goals at the end of the second world war. but tensions over post—brexit trade arrangements for northern ireland risk overshadowing their discussions. paul adams reports. it's not every day the american president comes calling. joe biden, accompanied by his wife, touching down in newquay late last night. a warm welcome at the start of a complex, challenging week of diplomacy. earlier at raf mildenhall, a chance to mingle with american troops and set out his stall. i'm heading to the g7, then to the nato ministerial and then to meet with mr putin to let him know what i want him to know. america, he said, was back — ready to work with allies to tackle coronavirus and climate change, and prove that democracies still work in the face