Although I encourage you to watch the entire video, I want to draw attention to the following quote from Sargent:
So here's a phrase that you hear; it's partly about language. You hear that US fiscal policy is unsustainable. You hear that over and over again. You actually hear it from both parties. And that can't possibly be true because government budget constraints are going to make it sustainable. So what they mean is that certain promises that people have made about taxes, entitlements, medicare, medicaid---those are incredible. They are not going to fit together. So the US fiscal policy is sustainable. It's very uncertain. It's uncertain because it's not clear which of these incredible promises are going to be broken first.
UPDATE: Peter Schiff engages in some creative editing to make it appear as if Sargent and Sims are know-nothings. Schiff uses an awkward pause and disclaimer by Sims (wherein Sims cautions the audience not to take the views of the two newest Nobel Laureates in Economics as irrefutable) to suggest Sims avoids the question. Schiff then skips from 15:35 to 16:13 (during which Sims presents his view) where Sargent says "I don't have much to add to that ... I was hoping he was going to ask about Europe." As the above quote captures, Sargent goes on to discuss his view of recent fiscal policy.
Schiff then manipulates a humorous move by Sargent---requesting a question about Europe and then, when the question is asked, deferring to Sims---to appear as if Sargent knows nothing about Europe as well. The audience recognized the humor with laughter and applause.
Shame on you, Schiff.