I have reached the incontrovertible conclusion that Donald J. Trump has just taken flight on a political kamikaze mission.

The Republican presidential nominee has determined two things:

* He cannot defeat Democratic nominee Hillary Rodham Clinton in the race for president.

* He is going to take as many of the Republican establishment hierarchy with him as he goes down in flames.

That can be the only conclusion to draw from his declaration of war against House Speaker Paul Ryan, arguably the nation’s most powerful Republican, the second in line in presidential succession, the guy who runs the legislative chamber where all fiscal matters are given birth.

I don’t have personal knowledge, of course, that Trump has surrendered the contest to Clinton. I merely am able to see and hear with my own eyes and ears what is happening.

He has been heard saying some hideous things about women. His poll numbers are plummeting. He didn’t deliver the goods in that second debate with Clinton. The polls are accelerating in Clinton’s favor.

Trump cannot win.

Moreover, I read today an item that suggests that independent candidate Evan McMullen, the Republican/Mormon challenger to both Clinton and Trump, has pulled even with them both, putting reliably Republican Utah of all places — where McMullen lives — into play.

They’re calling it a “scorched Earth” retreat. Trump says he is “unshackled” now by Ryan’s declaration that he won’t defend Trump or campaign on his behalf. Trump’s going to take the gloves off — not just with Clinton but with Republicans.

His tweet machine is being revved up for the final month of this miserable campaign. Trump is indicating a desire to let ‘er rip with snark-filled comments about Ryan, Clinton, Sen. John McCain — and anyone else who speaks critically of the nominee’s lack of credentials, qualifications, temperament or moral fitness to hold the job he is seeking.

It’s just amazing in the extreme that Trump would seek to take on the speaker of the House in this manner. All it tells me at this point is that he knows he hasn’t a chance of winning. So, he’s locked and loaded and is going out with guns blazing.