I think Biden is a target, or a possible target, or perhaps someone associated with him (Hussein?). Had to get this in place in case he won, hence it was done before the election, with the intent to only announce it if he won. It's also possible this relates to CamelToe in some way.
They've got big brass balls, you've got to give them that. Remembering how long it took Trump to get his cabinet confirmed …
And he has dementia, so he can't testify against anyone else. Or be jailed, probably.