The Trump administration announced tight new restrictions Wednesday on American travel and trade with Cuba, implementing policy changes President Trump announced five months ago to reverse Obama administration normalization with the communist-ruled island. Under the new rules, most individual visits to Cuba will no longer be allowed, and U.S. citizens will again have to travel as part of groups licensed by the Treasury Department for specific purposes, accompanied by a group representative. Americans also will be barred from staying at a long list of hotels and from patronizing restaurants, stores and other enterprises that the State Department has determined are owned by or benefit members of the Cuban government, specifically its security services.