Honestly I don’t think Trump has much chance of getting indicted (in US courts) for anything he did as Prez.
All those state charges floating around for old behavior, well, that’s another matter. And if he’s thinking straight, he’d better not plan on hanging around in Europe or a lot of the world because there’s a good case to be made for child kidnapping and genocide by his administration.
…now, the rest of the administration, that’s much more open-ended.