The Trump administration announced plans to further restrict travel to Cuba in April, when White House national security adviser John Bolton said the Treasury Department would “implement further regulatory changes to restrict non-family travel to Cuba.”

…The State Department announced that “going forward, the United States will prohibit US travelers from going to Cuba under the previous ‘group people-to-people educational’ travel authorization. In addition, the United States will no longer permit visits to Cuba via passenger and recreational vessels, including cruise ships and yachts, and private and corporate aircraft.”

…Cuban Minister of Foreign Affairs Bruno Rodríguez Parrilla, who reopened the Cuban embassy in Washington in 2015, called the new restrictions “an attack on international law.”

US announces new travel restrictions on Cuba, banning cruise ships – CNNPolitics