Miller stated that the United States would consider other options and some US lawmakers were advising against recognizing the results of the Feb 8 elections until the proposed investigation is completed.
Biden also noted that hundreds of thousands of people have no access to food, water or other basic services and many families have lost not just one but many relatives.
According to the latest tally by the Election Commission of Pakistan (ECP), results from 253 National Assembly constituencies had been announced as of Saturday afternoon, out of a total of 266.