At the height of the Cold War, the Soviet Union had thousands of nuclear warheads aimed at American cities, and the Soviets were subject to numerous arms controls agreements. But progress was hard-fought and incremental at best. In an ideal world, the Soviet Union would have agreed to more severe constraints than those agreed by Presidents Kennedy, Nixon, Ford, Carter, Reagan and Bush, for example. It would have dismantled all of its nuclear weapons, stopped its human rights abuses and halted its meddling around the world.
But, as all of these presidents – Democratic and Republican – understood, holding out for the impossible is a recipe for no progress at all. Congress should take the same approach today to the Iran nuclear deal.