Collins discussed the possible use of nuclear weapons in Korea with MacArthur in December, and later asked him for a list of targets in the Soviet Union in case it entered the war. MacArthur testified before the Congress in 1951 that he had never recommended the use of nuclear weapons. He did at one point consider a plan to cut off North Korea with radioactive poisons; he did not recommend it at the time, although he later broached the matter with Eisenhower, then president-elect, in 1952. In 1954, in an interview published after his death, he stated he had wanted to drop atomic bombs on enemy bases, but in 1960, he challenged a statement by Truman that he had advocated using atomic bombs. Truman issued a retraction, stating that he had no evidence of the claim; it was merely his personal opinion.