On the contrary, we appear to have actively sought A-7s. Initially, the Ford Administration was open to it. They lifted sanctions/restrictions & allowed Pakistan to evaluate F-5 & A-7, of which A-7 was selected. It was when Pakistan signed the agreement with France for reprocessing plant that the US began stipulating forgoing nuclear ambitions in order to acquire the A-7s. When Carter came to power he put the entire A-7 deal on the backburner, both because of Pakistan's nuclear ambitions & his own diplomatic efforts to improve relations with India. At one point the US even tried to convince Shah of Iran to dissuade ZA Bhutto/Pakistan from pursuing nuclear weapons, to which the Shah replied that the US should first sell A-7 that Pakistan is seeking. He said and I am paraphrasing 'Pakistan has no air force at the moment' and that 'without A-7s he would have nothing to convince Pakistan with.' In between this seesaw, the US even tried communicating with India that the A-7s would not alter the balance in South Asia.