Iran’s South Pars facility. Total struck a $1 billion deal in July that gave it access to the giant gas field. Mr. Trump said Friday he won’t recertify the 2015 international deal struck with Tehran , which lifted sanctions in exchange for promises by Iran to curtail its nuclear program. He also vowed to cancel the deal himself if Congress and U.S. allies don’t act to address his concerns about the accord. The moves stopped short of pulling the U.S. out of the deal. But they send the clearest signal yet that the Trump administration is serious about considering reimposing sanctions, raising the risk for companies doing business in Iran of falling foul of such restrictions. U.S. Secretary of State Rex Tillerson said the steps announced Friday shouldn’t affect American firms that have applied for special licenses to do business authorized under the nuclear deal. Boeing Co. BA -0.34% […]