Trump’s bizarre social media blitz leaves world guessing ahead of UN address

President has been posting on Washington arch, AI and his 25 top achievements' - the chances of an uplifting speech appear slim

The annual gathering of the United Nations general assembly has historically been a platform for US presidents to display their most serious face and a positive vision to the world.

From Harry Truman and Dwight Eisenhower to John F Kennedy and Barack Obama, over eight decades US leaders have used the setting to expound on grand themes before a global audience at pivotal moments in international affairs.