The claim of executive privilege generally relates to communications between the Executive Branch and other branches of government, since these are often the most secret.
It could be argued that immigration policy is both a foreign and a domestic policy concern because it has to do with the number and types of people entering the United States and subsequently the job market (being the domestic concern) and it has to do with how we treat the foreign nations from which the immigrants are coming (being the foreign concern).
On January 1, 1959 Fidel Castro, a nationalist, overthrew General Fulgencio Batista, Cuba's American backed president. This made the current US President Eisenhower and the VIA nervous. At that time almost half of Cuba's sugar plantations and most of its cattle ranches were owned by US companies and wealthy individuals, there was also a huge American influence over Cuba's mining operations as well. Castro, however, wanted to eliminate US influence over his nations industries.
Eisenhower, then Kennedy when he became President, arranged to train Cuban exiles in guerilla warfare to overthrow Castro. The first plan was to destroy Castro's tiny air force by bombing the air field. But Castro found out about the plan and moved the planes keeping them safe. The next plan was to send the guerilla exiles to invade a isolated spot on the island known as the Bay of pigs. But every detail of the operation was broadcasted by a small radio station on the island that the CIA failed to spot. So Castro was ready for the invasion. Castro's troops were able to pin the invaders, who surrendered in less than a day.
The Bay Of Pigs invasion was a total failure. Kennedy, who didn't want to start WWIll chose not to provoke a all-out war. in 1962the Cuban middle crisis began, which further strained tensions between the Soviet, Cuban and American governments.
With the compelling Spanish Armada out for the count, it opened the entryway for the investigation of the American landmass by the French and the British. As these two countries developed provinces in the "new world" they turned out to be increasingly affluent. England, which hadn't almost enough farmland to equip an armed force, and a deficiency of timber that made maritime extension troublesome, looked for both of these things in the American landmass.