The latest revelations come amid anger and fury; allegations that United States had tapped the mobile phone of German Chancellor Angela Merkel and that NSA had also monitored the Brazilian and Mexican leaders' communications, according to a local report. 
The National Security Agency monitored the phone conversations of 35 world leaders after being given the numbers by an official in another US government department, according to a classified document provided by whistleblower Edward Snowden. The confidential memo reveals that the NSA encourages senior officials in its "customer" departments, such as the White House,  State, and the Pentagon, to share their "Rolodexes" so the agency can add the phone numbers of leading foreign politicians to their surveillance systems. The document notes that one unnamed US official handed over 200 numbers, including those of the 35 world leaders, none of whom is named. These were immediately "tasked" for monitoring by the NSA. The NSA memo obtained by the Guardian suggests that such surveillance was not isolated, as the agency routinely monitors the phone numbers of world leaders -- and even asks for the assistance of other US officials to do so (Published Guardian October 24, 2013).  

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