WASHINGTON — In the weeks since Edward Snowden's unauthorized disclosures about some of the government's most sensitive surveillance programs, the former National Security Agency contractor has found an unlikely ally: Congress.

Lawmakers of all political stripes, some of whom also have expressed outrage at Snowden's actions, are now part of a growing coalition that is challenging the scope and effectiveness of the formerly secret operations for the same reasons that allegedly drove Snowden to disclose them — and for which he is now charged with espionage-related offenses.