UNITED NATIONS, Sept 22 (Reuters) - President Donald Trump said on Tuesday that Washington and Tehran were moving toward a settlement, while a senior Iranian official said Tehran could reopen the Strait of Hormuz within days if the US eased military pressure and lifted its blockade on Iranian ports.Trump's remarks came just hours after he repeated a threat at the UN General Assembly to annihilate Iran if it failed to strike a deal.Speaking after a meeting with British Prime Minister Andy Burnham at the United Nations in New York, Trump said: "They want to talk to us. They have been...