President Barack Obama said sentiment in Congress is building toward lifting the decades-old trade embargo with Cuba, but it’s “not yet at a critical mass” and that the next big step in restoring relations with the island nation will be left for his successor.

In an interview with CNN en Espanol days before his historic visit to Cuba, Obama also said Cuban President Raul Castro will take part in his planned meeting with dissidents. “That was part of the deal for me to attend and have Raul Castro there as well,” Obama said in the interview released Monday evening.