Our country has always drawn a line between our military and intelligence services, and domestic policing and spying,” the lawmakers wrote. “We do not — and should not — use U.S. Army Apache helicopters to quell domestic riots; Navy Seal teams to take down counterfeiting rings; or the NSA to conduct surveillance on domestic street gangs.”

The executive branch is able to change its rules for some surveillance programs without congressional approval. Without a law from Congress, the government relies on executive order 12333, which was signed by President Ronald Reagan in 1981 and later modified by President George W. Bush.