The top U.S. Senate Republican said on Sunday that Congress is likely to block any nominee that President Barack Obama names as ambassador to Cuba and retain broad economic sanctions, even as Obama moves to establish diplomatic and economic ties with the Communist-run island.

Senate Majority Leader Mitch McConnell, interviewed on the "Fox News Sunday" television program, said the Senate is unlikely to confirm any U.S. ambassador to Havana nominated by Obama.

McConnell added, "There are sanctions that were imposed by Congress. I think the administration will have a hard time getting those removed. This is a policy that there is substantial opposition to in Congress."