Senate Intelligence Chairwoman Dianne Feinstein (D-Calif.) on Monday called for a “total review” of all intelligence collection programs as she criticized the National Security Agency for spying on foreign leaders.

“It is abundantly clear that a total review of all intelligence programs is necessary so that members of the Senate Intelligence Committee are fully informed as to what is actually being carried out by the intelligence community,” Feinstein said.

Feinstein has been one of the NSA’s staunchest congressional defenders amid the uproar over its phone records surveillance, but she said that the spying on foreign leaders without President Obama’s knowledge was a “big problem.”