I’ve assumed Trump has refrained from prosecuting the e-mail scandal because he was hoping to get them to at least nominally cooperate in getting his agenda accomplished. My secondary suggestion that he pass along the back-channel threat that he was considering appointing a prosecutor for Hillary and co. takes this into consideration. Ultimately, this Russian BS has got to stop.
Here is my impression, for what it’s worth. The Democrats are VERY vulnerable in 2018. (They have 25 senate seats to defend, vs 9 for the GOP.) Right now, the Democrats are playing to their hardcore base and pretty much no one else.
The desire to see criminal Democrats prosecuted is almost solely confined to the conservative base. Voters in general didn’t put Trump over the top to see a lot of special prosecutors. They elected him to MAGA.
For the next two years Trump will concentrate on keeping campaign promises and turning the country around in such a way as dramatically benefits the masses. He wants to clean Dem clocks in 2018.
I speculate that we may see more legal action leading up to 2020. That would damage the national brand, set the base on fire (with enthusiasm), and by then would not be seen as a substitute for getting the economy roaring, etc.
Just my opinion.