The U.S. Justice Department is preparing to file criminal charges against Edward Snowden, the man who confessed to leaking top secret documents on the National Security Agency’s vast surveillance programs, according to two law enforcement officials.

The sources said the U.S. government is trying to act quickly to set in motion the machinery to bring Snowden back home, as a columnist involved in breaking a series of stories based on Snowden’s information says there’s much more to come out.