Welcome to Pushback. I'm Aaron Mate. The U.S. continues to seek the extradition of WikiLeaks founder Julian Assange, even as a critical part of its case has fallen apart. In a new interview, the key witness for the U.S. extradition attempt has admitted that he fabricated

critical parts of his testimony. Well, joining me now is the journalist who broke this story.

Bayatmar Alexanderson is a reporter with the Icelandic newspaper, Stundon.

Biatmar, welcome to pushback.

Thank you. So tell us who this key witness is, Sigurdur Thorderson, and what he admitted to you.

Well, that's a long story he has.

Basically, his name is Sir Inky Thurderson, but he's actually changed it to Sigurdurthorson.

So, but it's a common thing among criminals here in Iceland to change the names a little bit.

He's, he's born and is an Icelandic citizen, and he's also named Siki the Hacker.

He's known by that name also.

Although that name doesn't really fit since, according to our investigation, he has actually

no hacking skills, even in chat logs that we have at Stunton shows that he's

actually asking the FBI for assistance to get a video of a mobile phone.

So he has not so much talent in that field.

Well, Siki is actually a former WikiLeaks volunteer and he actually went to the

US embassy on the 23rd of August of 2011 to become an FBI informant for the U.S. government.

So he actually alleged, according to the indictment, and according to his testimony through the indictment, that Julian Assange did some hacking.

And actually, in the indictment, you can see how it tells that Julia and

Sikki did things together. And the strange part about the indictment and what he tells me is that

it doesn't fit. And we can go into these details later if you want to, but this character is actually

has been charged and convicted for perpetrating against young boys down to 15 years old.

And he's also a con artist here. He's actually been charged and convicted

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