WASHINGTON (Sputnik) — The document, originating from the Director of National Intelligence and dated July 16, 2010, purported to identify "foreign-based political organizations" allegedly targeted by US intelligence.
"Our government specifically authorized the hacking of political parties. Mistakes were made," Snowden said in a Twitter message.
Among them were Egypt's Muslim Brotherhood and National Salvation Front, the Pakistan Peoples Party, the Lebanese Amal group and the Indian Bharatiya Janata Party.
DNC and other US sources have claimed Russian responsibility for the hack.
In 2013, Snowden leaked a cache of intelligence documents revealing widespread US surveillance practices at home and abroad. Snowden is currently living in exile in Russia, and faces charges of espionage and theft of government property in the United States.