Despite on-again, off-again negotiations, the United States has no other option but to pursue a diplomatic solution with Iran, argues Vali Nasr, professor of international affairs and Middle East studies at Johns Hopkins University.

Nasr tells host Steve Clemons that the US-Israel war on Iran has shown the limits of military force.

“You don't go to the table to demand surrender. The other side is not going to surrender because they haven't lost. So you have to cut a deal,” Nasr said, adding that Iran’s objective is to make sure the US and Israel understand that “war with Iran isn't easy”.

A weekly take on US politics and policies and how they affect the world.