In the mid-1970s, Pakistani intelligence officials began privately lobbying the U.S. and its allies to send material assistance to the Islamist insurgents. Pakistani President Muhammad Zia-ul-Haq's ties with the U.S. had been strained during Jimmy Carter's presidency due to Pakistan's nuclear program and the execution of Zulfikar Ali Bhutto in April 1979, but Carter told National Security Adviser Zbigniew Brzezinski and Secretary of State Cyrus Vance as early as January 1979 that it was vital to "repair our relationships with Pakistan" in light of the unrest in Iran.