"You do have to wonder if Comey will now be much more likely to spill the beans the next time he's up in front of the committee."
A good question for any committee member cross-examining him: "Mr Comey, would it materially change your views on security of communications to learn that the President ordered your phone to be backdoored and that you were fired because of what was overheard?"
Although it's a speculative question and he'd reckon the premise was almost certainly untrue he couldn't be sure it wasn't so it would immediately get him thinking back recent conversations to see what might be held against him. It would soften up his defences against the next question which would be the real one.
And I'd like to see what being out of office has done to his thoughts about communication security.