Several trips to Cuba by American lawmakers are in doubt amid questions over the communist government's eagerness or ability to accommodate a surge of interest and possible investment from the United States.
U.S. officials say the Cuban government has pushed off all congressional visits, including one by House Minority Leader Nancy Pelosi, until at least mid-April.
The Cuban Interests Section in Washington says some will go forward in the coming days, but others are postponed.
Several members of Congress had planned to visit the island this month, including Democrats like California's Pelosi and Republicans such as Arizona's Sen. Jeff Flake, who has proposed ending the U.S. travel embargo of Cuba.
U.S. and Cuban officials spoke on condition of anonymity because they were not authorized to speak publicly on the issue.