Four decades after Daniel Ellsberg leaked the Pentagon Papers, another whistleblower emerged from within the US intelligence community.

The only thing I want from the government, in order to come back and stand trial, is guarantees of a fair trial where I can put forth a public-interest defence.

Edward Snowden

Hailed by some as a hero, and called a traitor by others, Edward Snowden's revelations about US mass surveillance transformed the debate over privacy, liberty and security.

In UpFront's Headliner segment, Snowden responds to his critics, including presidential hopefuls Hillary Clinton and Donald Trump.

He describes his life in exile and comments on what it would take for him to return to the US. 

Mehdi Hasan also asks whistleblower Daniel Ellsberg if the end justifies the means.

Watch UpFront on Al Jazeera English on Fridays at 1930GMT. Follow UpFront on Twitter @AJUpFront and Facebook 

Source: Al Jazeera