Iran accused major powers on Friday of backtracking on previous pledges and throwing up new "red lines" at nuclear talks, after the deadline to reach an agreement in time to receive expedited scrutiny from the U.S. Congress expired with no deal.
Iran and six world powers were close to an historic nuclear agreement on Thursday that could resolve a more than 12-year dispute over Tehran's nuclear ambitions, but they remained deadlocked on the issue of Iranian arms and missile trade.
The top U.S. and Iranian diplomats met for a sixth consecutive day on Sunday to try to resolve obstacles to a nuclear accord, including when Iran would get sanctions relief and what advanced research and development it may pursue.
The U.S. State Department on Monday declined to say whether Secretary of State John Kerry would be willing to testify to a Republican-controlled congressional panel that is probing a 2012 attack on U.S. diplomatic facilities in Benghazi, Libya.
