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Italian PM: Alleged Spying On Italy By US 'Unacceptable'

AP Photo / Yves Logghe

Letta told reporters at a European Union summit that he disapproved of such actions.

"It is inconceivable and unacceptable that there should be acts of espionage of this type," he said.

On Wednesday Angela Merkel confronted President Obama about reports that the U.S. may have monitored her phone calls, and the White House maintained that the U.S. "is not monitoring" her calls.

The Guardian reported Thursday that the U.S. National Security Agency has monitored the phone conversations of 35 unnamed world leaders, according to an Oct. 2006 memo provided by former NSA contractor Edward Snowden.