Regarded as a hero by some, Edward Snowden's mass surveillance leaks have also generated a number of high-profile critics. In this online preview, Snowden takes on his critics, including presidential hopefuls Hillary Clinton and Donald Trump.

It's very difficult to respond in a serious way to any statement that’s made by Donald Trump.

Edward Snowden

Commenting on the controversy surrounding Clinton's emails, Snowden said: "This is a problem because anyone who has the clearances that the secretary of state has, or the director of any top level agency has, knows how classified information should be handled."

"If an ordinary worker at the state department or the Central Intelligence Agency [...] were sending details about the security of embassies, which is alleged to be in her email, meetings with private government officials, foreign government officials and the statements that were made to them in confidence over unclassified email systems, they would not only lose their jobs and lose their clearance, they would very likely face prosecution for it," Snowden added.

Snowden also responded to Trump, who has called him a "total traitor", saying: "It's very difficult to respond in a serious way to any statement that’s made by Donald Trump."

Watch the full episode on Al Jazeera English on Friday, September 4, at 19:30GMT.

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Source: Al Jazeera