Put yourself in the shoes of the man investigating whether the president of the United States and his team “colluded” with Russians who attacked our electoral system in 2016.

The object of that probe, Donald J. Trump, continues to fire off Twitter messages accusing Robert Mueller of conducting a “rigged witch hunt.” He says the probe needs to look at Democrats. He questions whether Mueller has a “conflict of interest” because of his friendship with a fired FBI director.

The president accuses Mueller, himself a former FBI director, of being corrupt and biased.

CNN reports: The attacks are not simply a window into his own rage, they also represent a coherent hardball strategy to unite his ever loyal political base and other Republicans behind him. With 100 days to go until midterm elections, that could be tough for the GOP.

How might you react to all of this?

Me? I would be incensed. I would be outraged. I would be damn angry at the president. Here’s the good news: It’s not about me. It’s all about a man who was praised universally when he got the special counsel job.

Mueller is on task. He and his legal team have kept their mouths shut. They have said nothing publicly about the shaming the president keeps heaping on them. They are acting professionally and with decorum and dignity.

Trump is acting, um, like an ass.

The president’s continuing harangue reveals a serious in this individual’s state of mind. No, I am not suggesting some mental disorder. I am suggesting that Trump possesses a personality trait that suggests a certain emotional instability.

Does that disturb you? If not, it should. It damn sure bothers me.

I have declared repeatedly on this blog that Donald Trump is unfit for the office he holds. His constant barrage in the face of a serious — and so far productive — investigation simply reaffirms what many of us have been saying since Day One of this individual’s presence on the political stage.