Ah, thank you for this. Forgot about that.
However, what exact consequences could they hit Sanders with (that he won't likely be hit with anyway for his conduct and the bridges he's burned), especially considering he's losing anyway? I mean, like the FEC's questions about some of the Sanders' campaign contributions, or how he responded when his campaign got caught accessing the Clinton's campaign data, would that be something that he'd either be able to delay or worm his way out of, or are just completely fangless?
That is to say, since it's clear that Sanders is going to lose at this point and he knows this and was only running as a Democrat for the sake of convenience to begin with and is going scorched earth anyway, I'm not sure the DNC/DSCC could hit him with anything he would care about if he really wants to make this happen.
Which then really puts the question on Trump, I suppose, and whether he was serious or just joking but since Sanders bit...