Clarify what time periods this covers, so the correct Presidents can be indentified, please.
Ronald Reagan till 1988. He was the main force behind backing Pakistan/ISI/Mujahideen. Turned a blind eye to the long term ills of his policies.
Bush Sr till 1992. Conveniently forgot about Afghanistan after the fall of the Soviet Union puppet, Najibullah.
Clinton till 2000. Allowed the festering wound in Afghanistan to become gangrenous. Despite Khobar, Cole, WTCI, and the embassy bombings.