U.S. Secretary of State Rex Tillerson said on Saturday that working groups on fixing what the U.S. sees as flaws in the Iranian nuclear deal have already begun to meet, trying to determine the scope of what is needed and how much Iran needs to be engaged in it.

Tillerson, ending a week-long European trip in Warsaw, said that he had secured support from Britain, France and Germany – all parties to the 2015 agreement – to work on the deal that President Donald Trump has warned he will walk away from unless changes are made. Continue reading.