Is the government using cellular data to track Americans as they move around the U.S.?

According to the general counsel of the National Security Agency, it may have that authority. Matthew Olsen, who is currently at the NSA and has been nominated to lead the National Counterterrorism Center, discussed the possibility at a confirmation hearing Tuesday morning in the Senate Select Committee on Intelligence.

"There are certain circumstances where that authority may exist," he said. His comments came after Sen. Ron Wyden (D., Ore.) asked him several times whether the government has the authority to "use cell site data to track the location of Americans inside the country."

Although Olsen acknowledged the possibility, he also said "it is a very complicated question" and that the intelligence community is working on a memo that will provide a better answer for the committee.

Sen. Dianne Feinstein, the California Democrat who chairs the committee, asked that such a memo be prepared in time for the committee's first hearing in September, after the August recess.