(Reuters) -U.S. Secretary of State Marco Rubio and the foreign ministers of France, Germany and the UK agreed in a phone call on Monday to set the end of August as the de facto deadline for reaching a nuclear deal with Iran, Axios reported, citing three sources.

If no deal is reached by that deadline, the three European powers plan to trigger the “snapback” mechanism that automatically reimposes all UN Security Council sanctions that were lifted under the 2015 Iran deal, according to the Axios report.

(Reporting by Ismail Shakil in Ottawa)