This similar kind of political attack didn't work in 2016 so why should it matter now? Why would they bother? Trumps just going to point out the hypocrisy and scandals of his opposition and level the playing field. Pointing out they're all crooked makes these points moot, which Trump does. When questioned about his taxes by Hillary, he said he was being smart like other businessmen. She mostly ignored and blew off the email questions by Trump. I'm sure he'll also point out how he donates his Presidential salary since he couldn't legally refuse to accept payment for his position.
This tactic makes it so the only thing that really matters is what you're going to do for the country, and your political history in terms of what you've backed while in Gov. Using this tactic against lifelong politicians makes it much easier for Trump to look like the better choice, since he hadn't been part of it at all prior, and only has 4 years now when compared to close to 50 for Biden. Unless they have yet another offence as President that they can legitimately pin on him, throwing personal dirt at him won't help.
