Two days before the program's approval, Nathaniel Davis, the Assistant Secretary of State, told Henry Kissinger, the Secretary of State, that he believed maintaining the secrecy of IA Feature would be impossible. Davis correctly predicted the Soviet Union would respond by increasing involvement in the Angolan conflict, leading to more violence and negative publicity for the United States. When Ford approved the program, Davis resigned. John Stockwell, the CIA's station chief in Angola, echoed Davis' criticism saying that success required the expansion of the program, but its size already exceeded what could be hidden from the public eye. Davis' deputy, former U.S. ambassador to Chile Edward Mulcahy, also opposed direct involvement. Mulcahy presented three options for U.S. policy towards Angola on 13 May 1975. Mulcahy believed the Ford administration could use diplomacy to campaign against foreign aid to the communist MPLA, refuse to take sides in factional fighting, or increase support for the FNLA and UNITA. He warned however that supporting UNITA would not sit well with Mobutu Sese Seko, the president of Zaire.