Donald J. Trump keeps telling us about his business acumen, his ability to craft “great deals,” his no-nonsense approach to just about everything he has ever done in his entire life.

If he is a man of his word, then he’s got to fire someone — or several someones — over the embarrassment they have brought to his campaign and to his wife, Melania.

The Republican presidential nominee’s wife gave what had been hailed initially as a fine campaign speech on behalf of her husband.

Then came news of an entirely different kind. Melania Trump lifted passages of her speech from a 2008 speech delivered by none other than Michelle Obama, the wife of the man every Republican in the Cleveland convention seems to hate.

Now comes the quarrel over whether she plagiarized Michelle Obama’s speech. New Jersey Gov. Chris Christie said she didn’t, that “93 percent” of Trump’s speech was her own. Others have quibbled over Barack Obama’s lifting of remarks from then-Massachusetts Gov. Deval Patrick’s speech.

Look, Mrs. Trump got embarrassed. So did her husband, whose campaign has shrugged off the criticism. That’s the campaign’s call to make.

But it does reveal a fundamental flaw in the Trump campaign apparatus, which is that no one looked over nominee’s wife’s shoulder to protect her and her husband from the kind of gaffe that occurred.

Melania Trump in many ways is an accomplished individual. She speaks several languages. She is not, however, a polished political spouse.

I have zero clues as to how this situation developed. I have a better idea, though, about how it could have been prevented. That responsibility belonged to the individuals in charge of Donald Trump’s campaign.

They let him and his wife down.

Donald Trump will boast all he wants about how he plans to win this election. It starts, though, with building a campaign organization run by people who know what they’re doing.