I didn’t expect to agree with Stephen K. Bannon on anything.

But you know what? The former chief strategist for Donald John Trump Sr. said something on “60 Minutes” that makes me rethink that notion.

He said the president’s decision to fire FBI Director James Comey is the “biggest political mistake in recent political history.”

I believe Bannon is on to something.

Trump canned Comey because of the “Russia thing.” He said initially the Russia probe wasn’t a factor; Vice President Mike Pence said the same thing. Then the president blabbed to NBC News anchor Lester Holt that, yep, Russia was the reason.

Then came Robert Mueller, the former FBI director who was hired by Deputy Attorney General Rod Rosenstein to become special counsel. Mueller is off and running; he has hired a crack team of legal eagles; the “Russia thing” is getting pretty damn serious.

Mueller is examining whether the Trump presidential campaign colluded with Russian computer hackers who sought to meddle in our electoral process in 2016. He is going full bore, as he should. Had the president not fired Comey, Bannon said, there would be no Mueller, no special counsel, no need for concern among Trumpkins that Mueller has smelled blood in the political water.

Bannon is a tremendously objectionable character. He is back where he came from, as editor in chief of Breitbart News. Bannon had no business in the West Wing. His political experience is just a shade greater than Donald Trump, who had none before he entered the 2016 presidential campaign. Bannon is a right-wing provocateur and political hack who once sat on the “principals committee” of the National Security Council. Then the president wised up and removed him.

However, Bannon is likely quite correct about what Trump may have done to his presidency by kicking Comey out the door and ushering in the Age of Mueller.

And isn’t it fascinating that someone who professes such admiration for Donald Trump might have given the special counsel — Mueller — an even more inviting target by talking about potentially grievous political consequences the president has delivered to himself?