(NPR) WikiLeaks founder Julian Assange is “seriously considering” a request to testify in person before the U.S. Senate intelligence committee about Russian interference in the 2016 U.S. presidential election, according to a statement from his lawyer.

Assange has been holed up at Ecuador’s embassy in London since 2012, in part over fears that he could be extradited to the U.S. and potentially face trial over leaking massive troves of documents.

On Wednesday, the WikiLeaks Twitter account posted a letter that it says was delivered to Assange via the U.S. Embassy in London. The purported document is signed by committee Chairman Richard Burr and Vice Chairman Mark Warner and asks that Assange “make yourself available for a closed interview with bipartisan Committee staff at a mutually agreeable time and location” as part of the probe.

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