Chaos is running rampant throughout the executive branch of the U.S. government.

Nope. It isn’t a “fine-tuned machine,” no matter what Donald Trump calls it. It is a clanking, sputtering bucket of bolts with the wheels about to fly off the rickety machine.

Defense Secretary James Mattis has resigned, revealing specific differences of world view with the commander in chief. He becomes the eighth Cabinet officer to resign or be fired in the first half of the president’s term in office.

Three Cabinet officials quit under clouds of scandal. Three of them were canned outright. Yet another one resigned for reasons that weren’t entirely clear.

Let’s not forget the departure of two White House chiefs of staff, several communications directors, two national security advisers and any number of lower-level White House aides.

Now this happens. I happen to be a huge admirer of Secretary Mattis. I admire his military background, his studious nature, his commitment to the men and women in uniform. I admire his steady hand and his repeated resistance to the president’s impulsive nature.

He has had enough of the chaos. This decorated Marine Corps general can no longer answer to a commander in chief who operates the way Donald Trump seeks to operate.

Chaos is Donald Trump’s modus operandi. He revels in it with no understanding — none at all — of the misery and mayhem it creates for those who must deal with it up close.

And this all comes as the president responds to the bellowing of his political base and insists after all for money to build that wall along our southern border. What’s more, the government well might shut down partially at midnight Friday, putting thousands of federal workers out of a job right before Christmas.

This is not how you make America great again. It is not how you tell it like it is. It is not how you win.

This is a frightening time. James Mattis’s upcoming departure signals a growth in chaos at the highest — most sensitive — levels of our government.

Read Mattis’s resignation letter right here. Then ask yourself: Is this any way to run the world’s most indispensable nation?