Willing to bet they’re hoping to use Hunter to find something on Biden that they can impeach for that’s completely unrelated to the case, a la Monica Lewinsky and Bill Clinton.
You know those scenes in a spy movie where the bad guys start torturing the hero, but he just takes it? Then they threaten the hero's family and he immediately concedes. "Joe, just announce that you won't seek a second term, and I'm sure we can find a pre-trial diversion program for Hunter."