Update (12:50 pm ET): After what was by all accounts a contentious hearing, the sentencing has been postponed to give Flynn more time to cooperate. After the judge 'hinted' that prosecutors might have considered charging Flynn with treason, Flynn agreed to take more time to offer more 'cooperation' with authorities.
Sullivan apparently regrets suggesting that Flynn committed treason, telling Flynn and his lawyers not to "read too much" into his questions.
"I was just trying to determine the benefit and the generosity of the government," Sullivan said. "Don't read too much into the questions I ask." Prosecutor Brandon Van Grack said Mueller's team has "no concern" or no reason to think Flynn committed treason.
Flynn's sentencing has been delayed until after a hearing in late March that will determine the status of his cooperation, which is a long time for Flynn to sit and stew after the judge openly told him he was considering sending Flynn to prison and told him he was "disgusted" with his conduct.
Update (12:45 pm ET): The hearing has started back up again, and Judge Sullivan has made clear that he wasn't suggesting that Flynn had committed treason, saying "the government has no reason to believe Flynn committed treason."
"I felt terrible about that," Sullivan said, after the prosecutor notes Flynn's conduct as a foreign agent ended in mid-Nov 2016. "I'm not suggesting he committed treason," Sullivan added.
Flynn's lawyer said he held "nothing back" in the cooperation deal.