Carnival Sunshine (copy)

The Carnival Sunshine (above) was scheduled to take passengers from Charleston to Havana starting later this year. Those cruises are now canceled under a new crackdown on U.S. travel to Cuba. File/Provided

Carnival Cruise Line has canceled seven planned cruises between Charleston and Cuba after the Trump administration announced new travel restrictions to the communist island nation this week.

The company said in a written statement that passengers who already have booked their cabins will be notified by mail in next few days. It also apologized "for this unexpected change."

One Carnival ship that was scheduled to dock in Havana on Thursday is being rerouted to Cozumel in Mexico, the company said.

For any planned 2019 sailings to Cuba, Carnival passengers can cancel their trips for a full refund, or they will receive a onboard spending credits of $50 to $100 if they stick to their original itineraries or rebook on another cruise.

The same options apply for sailings next year, except the company is not offering any credits, according to a travel advisory.

Cruise travel from the U.S. to Cuba began three years ago under President Barack Obama. The new crackdowns are part of a broader effort by President Donald Trump's administration to roll back efforts to restore normal relations between the two counties, which drew sharp criticism from the more hardline elements of the Cuban-American community and their allies in Congress.

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The cruise restrictions took effect Wednesday, affecting nearly 800,000 passengers already on ships or booked for future voyages, according to the Cruise Lines International Association, an industry trade group.

Carnival announced its seven scheduled sailings between the Port of Charleston and Havana about a year ago, saying Cuba was becoming a popular destination.

The inaugural four-day cruise on the locally based Sunshine was scheduled to leave the State Ports Authority's Union Pier Terminal on Nov. 21. A series of five-day trips were to follow starting on Jan. 6 and running through April 27.

The 3,002-passenger Carnival Sunshine was to be the largest pleasure ship ever to call in Havana, and it would have been the first-ever cruise to Cuba from Charleston.

The Associated Press contributed to this report. Contact John McDermott at 843-937-5572 or follow him on Twitter at @byjohnmcdermott