I believe the Trump campaign has some significant dirt on Biden (oppo research) that they have not dumped yet just how Bush had stuff on Kerry in 2004.
They went through a disinformation operation to manufacture that stuff and he got impeached for it.
And then the Trump campaign/Russians seemingly tried to do it again via Reade.
Nothing's been sticking, but their pattern of behavior suggests they'll try to invent something again. After focusing on nepotism/corruption and sexual assault allegations, I don't know what else they could try to create, though. It seems as if the media has gotten a little better at sniffing out the BS. There's a reason why the Reade story never really took flight.