Though a bill to terminate the remaining travel restrictions to Cuba garnered 55 votes in the Senate last week, President Trump is considering reviving limits on travel to the island, potentially disrupting investments in Cuba made by travel companies since President Barack Obama relaxed restrictions in 2014.

Since that time, Starwood Hotels & Resorts struck a management deal with two hotels in Cuba. Airlines including American, JetBlue, Southwest and United began direct flights. Cruise traffic, too, is growing; in addition to several smaller lines, Norwegian Cruise Line now travels to the island, and Holland America Line just announced its intention to begin cruising there in December.

“Now there are a lot of investments and a lot of skin in the game, and it’s a more complicated picture,” said Tom Popper, president of Insight Cuba, which has been operating tours on the island since 2000.

What a change in policy would look like with respect to travel remains unclear. It’s possible the White House could impose stricter regulations on travel licenses, several tour operators say, or return to the restricted licensing in place before December 2014.