dr. colin kahl, who is also a senior fellow at the center for new american security. when compared arguing that time is running out to stop program and that a military strike is less risky is dr. matthew kroenig, an assistant professor at the georgetown university department of government. he is also the author of exporting the bomb, the spread of nuclear weapons. he is also the council on the fellow. there will be making the opening statements, followed by some questions and answers on the sanctions, and you will also have the opportunity to ask questions before we wrap up with closing statements. i want to begin with you, dr. matthew kroenig. >> thank you very much for that introduction. it is a pleasure to be here. i think many of us would agree that iran's rapidly advancing nuclear program poses perhaps the greatest emerging challenge to the country, and deciding on how to deal with it is the most important issue facing the united states government now. as i see it, they're all in three ways this issue will be resolved. first, a diplomatic settlement, second, acqui