On 16 June 2017, President Trump signed an Executive Order introducing new sanctions measures against Cuba. President Trump said that his administration would impose some of the sanctions on Cuba that were relaxed under the Obama administration. These measures do not re-impose the US trade embargo on Cuba, but enhances US travel restrictions to Cuba, and limits travel for non-academic educational purposes to group travel. The self-directed, individual travel permitted by the Obama administration will be prohibited. The measures prohibit transactions between US travellers in Cuba and entities related to the Cuban military, intelligence, or security services, including the Grupo de Administración Empresarial, which is in involved in many sectors of the Cuban economy.
The White House Fact sheet on the Cuba policy can be found here.