Rostow was supported by William Bundy, the assistant secretary for Asia, who advised Johnson in a memo on 1 March 1964 that the U.S Navy should blockade Haiphong and start bombing North Vietnam's railroads, factories, road and training camps. Bundy stated that the plans for stepped-up U.S involvement would "normally require" a declaration of war from Congress. Bundy advised against the "blunt instrument" of a declaration of war as at present Johnson still only had only "selective goals" in Vietnam, but stated that it would be "unsatisfactory" to have Congress not endorse the planned increased involvement in Vietnam for constitutional reasons. Bundy argued that the "best answer" to this problem was an event from Johnson's own career as a Senator when in January 1955 when he voted for the Formosa Resolution giving President Eisenhower the power to use military force "as he deems necessary" to protect Taiwan from a Chinese invasion. At the time, the Taiwan Strait Crisis was raging with the Chinese Communists bombarding several islands in the Taiwan strait still held by the Kuomintang regime in Taiwan, and many believed the congressional resolution giving Eisenhower the legal power to go to war in defense of Taiwan had ended the crisis.