Iran is pressuring Iraq to ask American troops to leave the country. Kenneth Pollack, middle east expert at the American Enterprise Institute says it's all part of the greater re-negotiation of the JCPOA, the multi-national agreement limiting Iran's ability to produce nuclear weapons. And he adds, the pressure play isn't going to work, but Pollack says, if the US and Iran are willing to re-commit to the old -- admittedly imperfect --  agreement, the world might be a safer place.