WASHINGTON, Jan. 14 -- President Donald Trump said he is imposing a 25% tariff on goods from countries "doing business" with Iran, ratcheting up pressure on the government in Tehran that has been rocked by widespread protests. Trump posted on social media on Monday that the new duty would be "effective immediately," without providing further detail. "Any Country doing business with the Islamic Republic of Iran will pay a Tariff of 25% on any and all business being done with the USA. This Order is final and conclusive," he said. Trump offered little clarity about how he defined "doing business with Iran." Iran's major trading partners include India, Turkey and China.P8...