He founded the China Development Finance Corporation (CDFC) in 1934, along with other prominent financial figures, such as Chang Kia-ngau, Chen Guangpu and H.H. Kung. CDFC provided China's chief access to foreign investment for the next decade. In summer of 1940, Chiang appointed Soong to Washington as his personal representative. His task was to win support for China's war with Japan. Soong successfully negotiated substantial loans for this purpose. Also, while in Washington in 1940, Soong managed to prevail upon President Roosevelt and his administration to back the plan of then-retired U.S. Col. Claire Lee Chennault to firebomb Japanese cities with Boeing B-17 bombers painted with Chinese Air Force markings and flown by American pilots from airbases in China, before the Japanese attack on Pearl Harbor. A scant month before the Pearl Harbor attack, the plan was scotched by U.S. Army Chief of Staff General George C. Marshall. After Pearl Harbor, Chiang appointed Soong Minister of Foreign Affairs, though Soong remained in Washington to manage the alliance with both the U.S. and the U.K.