All this gave the government a big problem. President Bush, after his June meeting with Benazir Bhutto, had agreed to sell sixty of the aircraft, a sale of a billion six hundred million dollars that the Pentagon—and Pakistan—badly wanted. But that sale hinged on the Pentagon's assurances to Solarz's subcommittee that the Pakistani government would not modify the F-16s for nuclear delivery. Furthermore, Barlow was involved just at that time with investigating four major criminal cases involving senior officers of the Pakistani Army who had attempted to make illegal purchases in the United States or abroad of American-made nuclear-related materials, including highly enriched uranium. One of the cases involved evidence showing that Pakistan was attempting to obtain dual-use items for its nuclear program by claiming that the materials were to be used for its F-16 fleet. The State Department's Near East Bureau had learned of Barlow's activity only a few days before.
On August 2, 1989, Arthur Hughes, a newly appointed Deputy Assistant Secretary of Defense, testified before the Solarz subcommittee that the F-16s to be sold to Pakistan would be stripped of nuclear wiring before delivery. To deliver a nuclear bomb, therefore, Hughes said, "it first would be necessary to replace the entire wiring package of the aircraft." Hughes assured Solarz, in response to a question, that the F-16s to be sold to Pakistan were not nuclear-capable unless the nuclear wiring, or some modification of it, was replaced.
Barlow knew that the Hughes testimony was totally contrary to the analyses that had previously been prepared. The fact that the Pakistani Air Force had practiced low-level F-16 delivery of nuclear weapons was widely known throughout the American intelligence community. The primitive delivery system required very little in the way of electronics or special wiring. Barlow informed his superiors, including Gerald Brubaker, his immediate supervisor, of his problems with the testimony, and urged that it be corrected.