Want to see stock markets go down? Let Iran hit you with nukes: Trump

US President Donald Trump said rising oil prices are a "very small price to pay" compared to allowing Iran to have nuclear weapons. "You want to see...stock markets go down? Start letting them...hit you with nukes," he said, adding that he had an "obligation" to attack Iran. "It'll be wrapped up soon...and we'll have a much safer world," he added.