As President-elect Joe Biden moves forward with his transition into office, he faces many challenges ahead, including navigating relationships with world leaders that have been dramatically changed by four years of President Trump. Already, a major test lies ahead with Iran promising to ramp up its nuclear program after the country's top scientist was assassinated. To discuss, Jim Braude was joined by Ambassador Wendy Sherman, who served as Under Secretary of State for Political Affairs under President Obama and led the US negotiations team in the 2015 nuclear agreement with Iran. She is now director of the Harvard Kennedy School's Center for Public Leadership.