Ah, you are wrong. DJT knew the Mueller investigation was BS from the start. He knew an impeachment process would produce nothing! He had the senate, no conviction would ever happen!
So why did he let this farce go on and on? I think he made a catastrophic decision early on, and look at what it has cost us.
If we lose in 2020, we will have the green new deal! That is on Trump!
There is no way that these idiots would have gained national attention without losing the 2018 elections.
And that is on Trump! He lost those elections by doing nothing about the Mueller investigation.
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I am not going to give you a rah, rah answer, EarlyBird, because I suspect we have all felt similar frustration, particularly about losing the House. I know I have.
However, I also know that some of the R. Congressmen we lost were not solidly behind the President. And I am not just talking about the ones that said so in public. (I know this for a fact.)
Also, there were the mysterious resignations or refusals to run again by so many. I am convinced we still do not have the real information behind many of these; but, regardless, it is not something the President could do anything about.
Likewise, we have to recognize the Senate "majority" was illusory--with Flake, No-name, Corker etc. You have to admit President Trump worked his heart out to keep and enhance the Senate ... which of course is also the key to ongoing confirmations of federal judiciary.
In summary, I think it was essential for President Trump to strengthen his defensive position before going on all-out attack. As a military man, I'm sure you can appreciate the fact that he may have had more insights into the actual strengths and weaknesses of his position (especially in early 2017 when the SC was appointed), than even you or I.