The Guardian last week reported that the US had spied on 35 world leaders, including Angela Merkel.
NSA and intelligence officials say the White House signed off on surveillance targeting friendly world leaders.
The LA Times reported:
The White House and State Department signed off on surveillance targeting phone conversations of friendly foreign leaders, current and former U.S. intelligence officials said Monday, pushing back against assertions that President Obama and his aides were unaware of the high-level eavesdropping.
Professional staff members at the National Security Agency and other U.S. intelligence agencies are angry, these officials say, believing the president has cast them adrift as he tries to distance himself from the disclosures by former NSA contractor Edward Snowden that have strained ties with close allies.
The resistance emerged as the White House said it would curtail foreign intelligence collection in some cases and two senior U.S. senators called for investigations of the practice.
France, Germany, Italy, Mexico and Sweden have all publicly complained about the NSA surveillance operations, which reportedly captured private cellphone conversations by German Chancellor Angela Merkel, among other foreign leaders.