Fridays at 8 p.m. and Encore Sundays at 10 a.m. on KPBS TV / PBS App. This Week: President Joe Biden is abroad this week, commemorating the 80th anniversary of D-Day while warning of risks to democracy around the world. His trip comes at a critical time, as the U.S. faces challenges from China, Russia and Iran. On a special edition, moderator Jeffrey Goldberg will be joined by Thomas L. Friedman, a Foreign Affairs Columnist at The New York Times, to discuss the difficulties in the Middle East, and the state of play in the war between Israel and Iran.