Last year, Mueller's team sought Miller's testimony regarding Stone,
WikiLeaks and the Russian government-controlled online persona Guccifer 2.0, which was used to release hacked
material during the 2016 election.
A hacker set up a website and Twitter account to take credit for the DNC breach soon after it was initially reported,
calling himself Guccifer 2.0(a moniker modeled after a Romanian hacker
who is recently pleaded guilty to hacking American political operatives).