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.In an exclusive interview, former British Prime Minister David Cameron talks about Brexit (and if it was a mistake which began under his watch), the U.S. House's impeachment inquiry, and Ukraine's role in it. Then Anne Applebaum with more on Ukraine, Dina Esfandiary on Iran, and Tom Friedman on Israel. GUESTS: David Cameron, Anne Applebaum, Dina Esfandiary, and Tom Friedman.