In November 1960, a coup attempt was made against Diệm. Minh, by this time disillusioned, did not come to Diệm's defense during the siege and instead stayed at his Saigon home. Diệm responded by appointing Minh to the post of Presidential Military Advisor, where he had no influence or troops to command in case the thought of coup ever crossed his mind. According to historian Howard Jones, Minh was "in charge of three telephones", and remained in the post until Diệm's overthrow.