The Eisenhower Doctrine was a policy enunciated by Dwight D. Eisenhower on January 5, 1957, within a "Special Message to the Congress on the Situation in the Middle East". Under the Eisenhower Doctrine, a Middle Eastern country could request American economic assistance or aid from U.S. military forces if it was being threatened by armed aggression. Eisenhower singled out the Soviet threat in his doctrine by authorizing the commitment of U.S. forces "to secure and protect the territorial integrity and political independence of such nations, requesting such aid against overt armed aggression from any nation controlled by international communism." The phrase "international communism" made the doctrine much broader than simply responding to Soviet military action. A danger that could be linked to communists of any nation could conceivably invoke the doctrine.

Most Arabs regarded the doctrine as a transparent ploy to promote Western influence in the Middle East by restraining Nasser's brand of Arab nationalism that opposed Western domination, and some like the Syrians publicly denounced the initiative as an insidious example of U.S. imperialism. Following the 1958 crisis in Lebanon and accusations by U.S. senators of exaggerating the threat of communism to the region, Eisenhower privately admitted that the real goal was combating Arab nationalism.