Kirstjen Nielsen is out as secretary of homeland security.

What in the name of governmental competence am I supposed to make of it?

She tussled with Donald Trump over immigration policy. I am trying to grasp what precisely caused the president’s homeland security honcho to resign — effective immediately.

Indeed, the immediate departure tells me that she pushed out the door. Reports indicate that Trump flamethrower Stephen Miller, the senior policy adviser from hell, has been engineering a top-to-bottom overhaul of the Department of Homeland Security.

Truth be told — if you want to call it that — is that Nielsen learned to lie as clumsily as Donald Trump. She had trouble justifying the parent-child separation policy the Trump administration enacted in its hideous effort to curb illegal immigration. Oh, and then this homeland security secretary of Scandinavian descent just couldn’t bring herself to acknowledge that Trump favors immigrants from that part of Europe over those who hail from “sh**hole” countries in Africa.

Now comes word that Trump wants to get even tougher on illegal immigration. So I guess Nielsen wasn’t quite on board. Is that so?

So the president has named an acting homeland security secretary, who will join the ranks of acting defense secretary, acting White House chief of staff, acting United Nations ambassador, acting interior secretary, acting EPA administrator.

Holy cow, man! The “best people” with whom the president surrounds himself keep heading for the tall grass.