The State Department on Friday conceded that there are significantly more Americans in Afghanistan than previously estimated -- leading to Rep. Darrell Issa, R-Calif., and other Republicans to accuse the administration of a "betrayal" of Americans abroad.

State Department officials briefed congressional staff this week and told them that it is in touch with 363 Americans in Afghanistan and nearly 176 legal permanent residents, a congressional source who was on the call told Fox News.