“It is a possibility, certainly from a humanitarian perspective, but — but it requires a change of attitude,” Zarif told correspondent Margaret Brennan in an interview with CBS News’s “Face the Nation” that will air in full on Sunday…

Zarif was asked about American prisoners being held in Iran, and whether he’d be willing to sit down with the Trump administration to talk about them.

“It is important, as I said, for the administration to show the ability to engage in a respectful discourse,” he said. “Before you make demands, the United States needs to learn how to treat other sovereign nations.”