By Stefan Boscia Joe Biden has emphasised his commitment to the post-Brexit Northern Ireland Protocol before his meeting with Liz Truss, telling the Prime Minister he wanted to hear “what’s on your mind”. The US President said in a short statement before the pair’s first bilateral meeting that the UK was the US’ “closest ally in the world” and that he looked “forward to working closely” with the new Prime Minister. The White House has told the UK that it must come to a mutual agreement with Brussels over how to fix the Northern Ireland Protocol – a post-Brexit treaty widely thought to be putti…