 Ambassador in an aviation crash, relations deteriorated quickly with upcoming prime ministers Benazir Bhutto and Nawaz Sharif.The United States took a tough stand on Pakistan's nuclear development, passing the Pressler amendment, while significantly improving the relations with India.Both Benazir and Nawaz Sharif also asked the United States to take steps to stop the Indian nuclear program, feeling that United States was not doing enough to address what Pakistan saw as an existential threat.