The Washington Post reports the deadline for an agreement in the Iran nuclear talks was officially pushed back by a week on Tuesday, as negotiators extended a temporary accord that limits Iran’s nuclear program. Without the last-minute extension, the interim agreement known as the joint plan of action would have expired at midnight. By announcing new timeline with just a few hours to spare, the negotiators made official what they have acknowledged privately for days — they could not make the June 30 deadline. In Washington, President Obama said Tuesday that any agreement with Iran must be verifiable, and he warned that the United States would “walk away” from one that does not demonstrably block Iran’s path to a nuclear weapon. He also cautioned that “deep-seated” distrust between Washington and Tehran would not vanish quickly.