The Trump administration has informed Cuba that President Miguel Díaz-Canel must resign for meaningful negotiations; the demand marks a significant hardening of U.S. policy. The Trump administration has delivered a blunt message to Havana: President Miguel Díaz-Canel has to go. U.S. officials told the Cuban government that for meaningful progress in negotiations, Díaz-Canel must step down, according to two people familiar with the talks. The demand represents a significant hardening of U.S. policy. Previous administrations sought policy changes, economic reforms or improved human rights. This is the first time Washington has explicitly called for removal of Cuba's sitting president as a precondition for talks. The message came through diplomatic backchannels in recent weeks. It coincides with an administration review of Cuba policy, including the island's spot on the state sponsors of terror list and enforcement of the Helms-Burton Act. Díaz-Canel, 65, took office in 2018, succeeding Raúl Castro as the first non-Castro to lead Cuba since the revolution. He has maintained the Communist Party's grip while overseeing a severe economic crisis mark...