NEW YORK — A civil rights group has sued the US government, saying it needs more information about surveillance of Americans’ phone and financial records to guide the public debate over what will happen when the law that regulates the scrutiny expires next year.

The American Civil Liberties Union sued the National Security Agency, the director of national intelligence, the CIA, and the Justice Department on Friday in Manhattan federal court, seeking information about a program that collects records during investigations into terrorism or clandestine intelligence activities.

According to the lawsuit, the government has not responded to requests made last month for information about its surveillance of Americans under a 2015 law. Congress used the law to set boundaries on the NSA’s bulk collection of call records and other data after former NSA contractor Edward Snowden leaked documents revealing extensive government surveillance.