Journalist and author Fareed Zakaria hosts this in-depth look at the major global developments of the week (the title's "GPS" stands for "Global Public Square"), with an emphasis on new ideas and innovative solutions to the world's toughest problems. Each episode also features Zakaria leading a panel discussion and interviewing a major world figure.This week: What the Magnitsky Act is; what happened in Canada that angered Putin; President Trump's tax reform proposal; the crisis in Catalonia; understanding genius through the works and life of da Vinci. Guests are William Browder, Larry Summers, Kevin Hassett, Michael Ignatieff, and Walter Isaacson.