US President Donald Trump says the US has agreed to a "massive" trade deal with Japan, one of the country's largest trading partners. The plan would result in Japan investing $550bn into the US and paying a 15% reciprocal tariff, Trump said in a post on social media. He added that Japan would open its economy to US goods, including cars, trucks, rice and certain agricultural products. Japan's chief trade negotiator, Ryosei Akazawa, said in a Facebook post that he had visited the White House, with the hashtag "Mission accomplished"