Two US officials involved in negotiations over renewing the 2015 Irn nuclear deal have stepped back from the talks and a third has left the team altogether amid internal discord over how firm the White House should be with Tehran, according to a report. Richard Nephew, the State Department's deputy special envoy for Iran who pushed for a tougher approach, has not been part of the talks since early December, Wall Street Journal reported Monday. A State Department spokesman told Reuters late Monday that Nephew was no longer in the envoy role, though he was still at the department. Two...