Julie Hirschfeld Davis and Michael D. Shear, Washington correspondents for the "New York Times", discuss their new book, "Border Wars", which provides an inside account of the defining issue of Donald Trump’s presidency: his steadfast opposition to immigration to the U.S. Davis and Shear have covered the Trump administration from its earliest days. In "Border Wars", they document how Trump and his allies blocked asylum-seekers and refugees, separated families, threatened deportation, and challenged the longstanding bipartisan consensus that immigrants make positive contributions to America.