Twitter CEO Jack Dorsey interviewed Edward Snowden on Tuesday via the social media company’s live-streaming service Periscope.

Hosting the event at the the tech company's headquarters in San Francisco, Dorsey, who supports a presidential pardon for the NSA whistleblower, spoke to Snowden for around one hour.

Twitter CEO Jack Dorsey live interview with Edward Snowden A photo posted by Matt Stewart (@stewy415) on Dec 13, 2016 at 9:35am PST

Questions were submitted to Dorsey using the hashtag #AskSnowden, and covered a variety of issues.

We’ll be live streaming a Q&A between @Snowden & @Jack tomorrow at 12:05pm EST! Tune in here and submit your questions now using #AskSnowden — Pardon Snowden (@PardonSnowden) December 12, 2016

With technology developing & evolving, what's the thing you're most worried about, in terms of both surveillance & in general? #AskSnowden — yazmin (@woIverinc) December 13, 2016

@PardonSnowden#AskSnowden Will you release the files that you still have? Is there anything there that's vital to international democracy? — Karen Honey (@IamKarenHoney) December 13, 2016

In September, Dorsey added his name to the ‘Pardon Snowden’ campaign supporting a presidential pardon for Snowden, who has been living in Russia since revealing details of the NSA mass surveillance programs in 2013. He faces two charges of espionage in the US.

READ MORE: #PardonSnowden: Privacy advocates shine messages of support on Washington landmark (VIDEO)

Dorsey was among the first to welcome Snowden to Twitter last year. Despite having 2.65 million followers, Snowden follows only one account – the NSA.