He may in fact not want to seek re-election, which I doubt, but as Earle said he has no choice unless he can cut multiple deals. He will have to make deals also on the behalf of his children and Kushner because the SDNY will have them in their crosshairs as well as the liar-in-chief. If he loses his re-election bid then he may not have any leverage to cut any kind of deal, unless he wants to throw himself under the bus to protect his children, which I don't see happening.
As for the Dems, IMO, their biggest threat is that Bernie's minions will pull their stay at home tactic again which will certainly benefit trump. I think we will get a clearer picture after the first few debates which should thin out the herd. My hope is that the House investigative committees keep the WH in turmoil enough to make it difficult to function in a campaign mode.