It's arriving faster than he thinks
Iran now possesses 5,600 centrifuges in which it can enrich uranium -- a 34-fold increase from 2006 -- and plans to add 45,000 more over five years. That will give Tehran an ability to make atomic bombs on an industrial scale.
Iran isn't just trying to build a bomb or two; it is aiming for the entire production pipeline -- that explains the Iranian emphasis on centrifuges. They likely could have bought enough fissile on the black market for several bombs. However, their goal here isn't just to bully neighbors with a few bombs; it's to build manufacturing capability.
... but hey, how 'bout that wacky Rush Limbaugh?