In theory they can do that but then the whole federal plea system would fall apart. Now the thing is the confessing to all crimes and getting immunity is really for someone giving states evidence, not a one off charge. This is a one off charge you don't get protection for all the things they don't know about or might come down the pipe yet.
Look at it this way. Say you're a mafia member and get caught doing X crime. You don't want to do the time. You tell the feds that you want to cooperate they're going to ask you to tell them everything you've done(that way they have leverage over you to make sure you cooperate). And then if they're going to use you as a CI you have to let them know every crime you're going to be involved in.
Now let's look at a one off situation. Say you get caught passing a fake check. You're looking at ten years but the feds say they'll give you 1 if you just take the plea. This is a one off plea deal. If they then find out you passed 9 more fake checks they can arrest you for those 9 and depending on the conditions of the plea and time that elapsed, that one year deal may now be voided. So it could be in your best interest to cop to the extra checks and show you're cooperating even if it means you might get another year or two because it could work out better for you.
Basically, everyone wants to do a plea deal because it is easier for everyone involved.
What it seems like here is Hunter wants to have his cake and eat it too. He knows there's other shit that coming down but is trying to get a pass without telling them anything.
In theory they can do that but then the whole federal plea system would fall apart. Now the thing is the confessing to all crimes and getting immunity is really for someone giving states evidence, not a one off charge. This is a one off charge you don't get protection for all the things they don't know about or might come down the pipe yet.
Look at it this way. Say you're a mafia member and get caught doing X crime. You don't want to do the time. You tell the feds that you want to cooperate they're going to ask you to tell them everything you've done(that way they have leverage over you to make sure you cooperate). And then if they're going to use you as a CI you have to let them know every crime you're going to be involved in.
Now let's look at a one off situation. Say you get caught passing a fake check. You're looking at ten years but the feds say they'll give you 1 if you just take the plea. This is a one off plea deal. If they then find out you passed 9 more fake checks they can arrest you for those 9 and depending on the conditions of the plea and time that elapsed, that one year deal may now be voided. So it could be in your best interest to cop to the extra checks and show you're cooperating even if it means you might get another year or two because it could work out better for you.
Basically, everyone wants to do a plea deal because it is easier for everyone involved.
What it seems like here is Hunter wants to have his cake and eat it too. He knows there's other shit that coming down but is trying to get a pass without telling them anything.