Mass migration presents a challenge to democracy in multiple ways. Chief among them is that anti-immigrant sentiment often plays a major role in the advance of illiberal and anti-democratic politics. We've seen this play out in the United States, where President-elect Donald Trump has promised a dramatic crackdown on immigration and the mass deportation of millions.

But the scale of today's migration may be dwarfed by what's to come. How has the movement of people affected the politics driving the development of surveillance, biometrics, big data and artificial intelligence technologies? And how do these technologies employed at borders and in governments themselves drive policy and change the way we think about the movement of people?

Today's guest has spent years traveling the world to study how technology is being deployed in border regions and conflict zones, and she's written a book about it. Petra Molnar is a lawyer and an anthropologist and the author of The Walls Have Eyes: Surviving Migration in the Age of Artificial Intelligence.