There is a sense out there - whether it started with Brexit, or the election of Donald Trump, or even earlier - that many liberal democracies face a challenge that's beyond the everyday back and forth of politics. Instead, it's got the ring of "us versus them," of my-country-first versus multiculturalism, a questioning about who gets to be part of the people. The Agenda asks where this worrying trend will lead, with Yascha Mounk, author of "The People vs. Democracy: Why Our Freedom Is in Danger and How to Save It," and National Post columnist Andrew Coyne.