The Iowa Caucuses are in full swing. Polls show that Hilary Clinton and Bernie Sanders are in a tight race on the Democratic side and Ted Cruz and Donald Trump are also close. The presidential debates and the 2016 candidates have focused on a range of issues up until now, ranging from ISIS to income inequality. Still, in a recent article in The Nation, author Andrew Bacevich argues there are big, important national security issues that none of the candidates are talking about, things like nuclear weapons and European security. Bacevich, professor emeritus of international relations and history at Boston University and author, most recently of Breach of Trust: How Americans Failed Their Soldiers and Their Country, joins us to talk about the issues he says, are missing from the campaign trail. His article “6 National Security Questions the Establishment Candidates don’t want to Answer,” appears in the Nation. Guest: Andrew Bacevich is professor emeritus of international relations and history at Boston University and author, most recently of Breach of Trust: How Americans Failed Their Soldiers and Their Country. (AP Photo/Jae C. Hong)