I believe Trump is thinking more strategically. Draining the swamp now (July) by taking charge of the FBI and DOJ would give the Dems and their media allies another opportunity to attempt to show Trump as above the rule of law and use it to Dem advantage in the November mid-term elections.
If the Pubs lose, the Dems will most certainly move to impeach and use the swamp draining as an excuse (obstruction of justice). If that happens, Trump will be in a straitjacket and will be hampered in his MAGA actions. If the Pubs retain the House (and Senate) he will be free to say he has the support of the American people when he does act.
Hopefully
Thanks for the thoughtful reply. Please see my #347.
Regards.