In this week's On The Line, host Jen Gerson speaks with New York Times columnist Ross Douthat, who was in Ottawa this week to give the inaugural Ian Shugart lecture, held by Christian think tank Cardus. Gerson grills Douthat on an infamous column he wrote earlier this year arguing Canada should join Empire America. They go on to discuss the religious and political landscape in the U.S., and what we have right -- and probably wrong -- about the advent of Christian nationalism.