What to know

• The leaders have spoken twice on the phone but have recently been at odds over major issues including the Falkland Islands and Northern IrelandS1
• The two leaders are expected to come face to face at the UN general assembly next week in New York.S2
• Labour chair Bridget Phillipson instead described the new Prime Minister Andy Burnham's previous criticism of the erratic US President on social media as 'politics'S3