 Complete the following phrase:  On June 4, 2019, the Trump Administration announced a full ban on cruise ship, private yacht, or plane travel to Cuba. It also announced a ban on people-to-people travel, which was until that point the most popular legal mechanism for American travel to the island, largely because it was the category used by cruise lines for their tours. The sanctions had been first mentioned a few days earlier, in a speech by US National Security advisor John Bolton to veterans of the failed 