United States, Britain, France, Germany, Russia, China and Iran have entered their final phase of negotiations in Vienna as the clock ticks down the deadline for a nuclear deal on Tuesday.

Some of the most contentious issues still loom large, such as questions of access and transparency, possible military dimensions to Iran’s nuclear activity, and sanctions. Many details are still confidential. Despite major obstacles to overcome, senior U.S. official remain optimistic that a deal could still be within reach.

If the talks extend past June 30, modest sanctions relief that has already been temporarily extended twice to Iran by the U.S. and European Union could easily be extended again. But Congress recently passed legislation that would create additional obstacles to final ratification if the agreement is not finalized by July 10.

As the negotiations pass the June 30 deadline, will a final deal come out before the walls close in? What will be the consequences if the negotiations fall through?

Guests:

Josh Lockman, International Law Professor and expert on U.S. Foreign Policy at the USC Gould School of Law

Robert Kaufman, a political scientist and professor of public policy at Pepperdine University specializing in American foreign policy, national security, international relations, and various aspects of American politics