Former Navy secretary Richard Spencer penned an Op-ed on Wednesday that blasted President Trump’s “unprecedented intervention” in Navy SEAL Eddie Gallagher’s case.

“President Trump involved himself in the case almost from the start,” Spencer wrote in the Washington Post.

He also admitted that it was “highly irregular” for high-ranking Navy officials like himself to be so personally involved in such matters.

“Normally, military justice works best when senior leadership stays far away,” he added.

The Navy SEAL was acquitted of murdering an Islamic State terrorist while deployed to Iraq in 2017. Gallagher was convicted of a lesser charge for posing for a photo with the militant’s corpse.

In the Op-ed, Spencer detailed three instances where Trump involved himself in the case, twice by phone call and once in a tweet.

Trump’s first communication occurred in March before Gallagher’s case commenced, Spencer said.

Before the verdict, Trump twice called Spencer, asking he remove Gallagher from confinement in a Navy brig.

Spencer said he “pushed back twice.” Trump then ordered Spencer to transfer Gallagher, he said.

Following the verdict, a peer-review board needed to be convened to determine what rank Gallagher could retire at, and if he could keep his Trident pin.

On Nov. 14, Spencer said he wrote Trump requesting he not get involved in the questions that would be addressed by the board.

“The next day, White House Counsel Pat Cipollone called me and said the president would remain involved,” wrote Spencer. Soon after, Cipollone called back, saying Trump wanted Spencer to reinstate Gallachper’s rank to chief.

“This was a shocking and unprecedented intervention in a low-level review,” said Spencer.

“It was also a reminder that the president has very little understanding of what it means to be in the military, to fight ethically or to be governed by a uniform set of rules and practices.”

In an attempt to ensure Gallagher’s case went before the peer-review board, Spencer said he began to work without consulting his boss, Defense Secretary Mark Esper.

“That was, I see in retrospect, a mistake for which I am solely responsible,” he said.

On Nov. 19, the Navy established the peer-review board.

“But the question was quickly made moot: On Nov. 21, the president tweeted that Gallagher would be allowed to keep his pin — Trump’s third intervention in the case,” Spencer said.

“The rest is history. We must now move on and learn from what has transpired.”

Spencer was ultimately canned because Esper said the Navy official went behind his back to cut a deal with the White House over Gallagher’s case.

Gallagher, meanwhile, will be able to retire and his planned disciplinary was scrapped.