A delegation of senior State Department representatives traveled to Cuba via a U.S. government plane last week, a department official and two U.S. officials told CBS News, a diplomatic opening as the island nation struggles with months of intense pressure from the Trump administration. While in Cuba, one U.S. diplomat met with Raúl Guillermo Rodríguez Castro, the grandson of former President Raúl Castro, who is widely seen as a key power center within the Cuban government, the State Department