Foreign policy comes to the fore as the political climate grows fiery in the wake of the attacks in Brussels. As Trump and Clinton prepare to square off, can either of them prove their presidential mettle in handling the heat?

From the early primary battles to the Super Tuesday showdown and beyond, pull back the curtain on the 2016 presidential race with Mark Halperin, John Heilemann and Mark McKinnon - and catch up on the electrifying first twelve weeks.