US President Dwight D. Eisenhower responded by authorizing Operation Blue Bat on July 15, 1958, in the first application of the Eisenhower Doctrine in which the US announced that it would intervene to protect regimes that it considered to be threatened by international communism. The goal of the operation was to bolster Chamoun's pro-Western Lebanese government from internal opposition and threats from Syria and Egypt. The plan was to occupy and secure Beirut International Airport, a few miles south of the city, and then to secure the port of Beirut and the approaches to the city.