CAMPAIGNERS have challenged Andy Burnham to stand up to Donald Trump when the British Prime Minister meets the US president for the first time today.The meeting in New York on the sidelines of the UN general assembly comes after at least two phone calls between the pair and is expected to primarily focus on the situation in Ukraine and the war on the Middle East.No 10 has said that the PM intends to use it to “drive forward work on issues that matter to people at home,” including the cost of living and the Russia-Ukraine war.