Just hours after Israel and Lebanon agreed to a US-brokered ceasefire, the leaders of Hezbollah say they reject the deal. For more than four decades, Hezbollah has faced repeated attempts to weaken its power, yet it remains a potent force in the region. Correspondent Isobel Yeung reports from Lebanon.  

Also on today's show: Jasmine Garsd, NPR Immigration Correspondent & Aaron Reichlin-Melnic, Senior Fellow, American Immigration Council; Dr. Mark Goldsmith, CEO, Revolution Medicines