Free Beacon:

Senators are questioning whether the National Security Agency collected bulk data on more than just Americans’ phone records, such as firearm and book purchases.

A bipartisan group of 26 senators, led by Sen. Ron Wyden (D., Ore.) asked Director of National Intelligence James Clapper to detail the scope and limits of the National Security Agency’s surveillance activities in a letter released Friday.

“We are concerned that by depending on secret interpretations of the PATRIOT Act that differed from an intuitive reading of the statute, this program essentially relied for years on a secret body of law,” the senators wrote in the letter.

The NSA’s surveillance program has come under intense scrutiny following a leak revealing the agency harvested the phone metadata of millions of American citizens.

The senators noted that the federal government’s authority under Section 215 of the PATRIOT Act is broad and rife with potential for abuse. Among the senators’ concerns was whether the NSA’s bulk data harvesting program could be used to construct a gun registry or violate other privacy laws.