They're going to go all in on the Hunter Biden Ukraine thing, as well as the "Joe Biden has dimentia" line of attack. The latter is risky because it's sure to fail if Biden shows up at the debates and is semi-competent (not a given admittedly), and the first is risky because it exposes Trump to attacks on his own blatant nepotism and corruption.
Both of them are risky.
The first would remind people that Trump was impeached for the Ukraine scandal.
The second would pissed of seniors.
Also if Trump tries to go after Biden for mental unfitness, it gives Joe a perfect opening to remind people of stuff like:
Look, having nuclear — my uncle was a great professor and scientist and engineer, Dr. John Trump at MIT; good genes, very good genes, OK, very smart, the Wharton School of Finance, very good, very smart — you know, if you’re a conservative Republican, if I were a liberal, if, like, OK, if I ran as a liberal Democrat, they would say I’m one of the smartest people anywhere in the world — it’s true! — but when you’re a conservative Republican they try — oh, do they do a number — that’s why I always start off: Went to Wharton, was a good student, went there, went there, did this, built a fortune — you know I have to give my like credentials all the time, because we’re a little disadvantaged — but you look at the nuclear deal, the thing that really bothers me — it would have been so easy, and it’s not as important as these lives are — nuclear is so powerful; my uncle explained that to me many, many years ago, the power and that was 35 years ago; he would explain the power of what’s going to happen and he was right, who would have thought? — but when you look at what’s going on with the four prisoners — now it used to be three, now it’s four — but when it was three and even now, I would have said it’s all in the messenger; fellas, and it is fellas because, you know, they don’t, they haven’t figured that the women are smarter right now than the men, so, you know, it’s gonna take them about another 150 years — but the Persians are great negotiators, the Iranians are great negotiators, so, and they, they just killed, they just killed us, this is horrible.
Or any of his other rambling incoherent speeches, deranged 3 AM tweets, erratic behaviors in the White House, countless impulsive and unhinged remarks and actions, etc.