“A principal argument, as national security advisor… McGeorge Bundy informed President [Lyndon B.] Johnson in a subsequent memorandum [on May 21, 1964] on ‘Student Travel to Cuba’ was that ‘a relaxation of U.S. restrictions would make it very difficult for us to urge Latin American governments to prevent their nationals from going to Cuba-where many would receive subversive training.’” [Pro Embargo]

“Robert F. Kennedy urged lifting travel ban to Cuba in ’63,” The National Security Archive, nsarchive2.gwu, April 23, 2009