White House says Iran nuclear talks still 'productive'

The White House on Wednesday said progress was still being made in crunch nuclear talks with Iran, but warned the United States would walk away if negotiations stall. "The sense that we have is that, yes, the talks continue to be productive and that progress is being made," said White House spokesman Josh Earnest. Marathon negotiations are taking place in Lausanne, Switzerland, between Iran and six world powers including the United States.