Which administration came up with the idea for the Bay of Pigs invasion?

Answer: The Eisenhower Administration

As soon as Fidel Castro came to power in January 1959, U.S. policymakers became increasingly concerned with the communist agenda of the island's new leader. Castro attacked U.S. companies and American interests in Cuba, and his anti-democracy rhetoric created tension between Havana and Washington. 

In March 1960 the current President, Dwight D. Eisenhower, ordered the Central Intelligence Agency to train and arm Cuban exiles for an attack on the island. Ultimately John F. Kennedy inherited the program when he became President in 1961, and was the one who gave the sign-off on the Bay of Pigs invasion. 

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