We are in the midst of yet another of Donald J. Trump’s self-inflicted spirals of terrible news. And with prominent Republicans saying they will back Hillary Clinton and others announcing this week that they won’t endorse Mr. Trump, there has been yet another round of speculation about how the party could get rid of him.

But it almost certainly can’t. And even if it could, it probably wouldn’t be worth the effort. Here’s why.

Republicans Are Stuck With Him

Under Republican Party rules, Mr. Trump is the only one who can take himself out of the race at this point. The only provision that exists for replacing a candidate nominated at the party convention, Rule 9, was written to apply only in the event of a candidate’s death or refusal to run.

Then the 168-member Republican National Committee — a body made up of the men and women from each of the 50 states, the District of Columbia and five territories — would be able to name a new nominee by a majority vote. Each state and jurisdiction is given the same number of votes as delegates it has to the national convention, so the system favors larger Republican-dominated states.