WASHINGTON—Saying it should be very clear by now that absolutely nothing can change their position on the matter, steadfast supporters of Republican presidential nominee Donald Trump told the rest of the nation Wednesday that it really shouldn’t bother trying to persuade them not to vote for him.

The announcement, which was issued by millions of the candidate’s staunchest proponents across the country, emphasized that if widespread condemnations of Trump’s temperament, denouncements of his racially charged rhetoric, and technical critiques of his sweeping immigration plan were going to sway their opinion, it would have happened already.

“You can keep writing editorials, running ads, and arguing with us at the dinner table or online, but honestly, at this point, it won’t make a bit of difference,” said diehard Trump supporter Bryan Gallagher, 66, who remarked that it had been “a complete waste of time” when 50 top GOP foreign policy experts published an open letter earlier this month suggesting a Trump presidency would gravely endanger national security, noting that he and everyone else who currently backs Trump is “in it for the long haul.” “You really have no chance of winning us over. You could bring out every living four-star general and have them list all the ways Trump would harm our country’s well-being, and we still wouldn’t budge.”

“Do you really think you’re going to come up with some new criticism of his policies or his preparedness that will finally make us reconsider our votes?” Gallagher continued. “Please, you should all just save yourself the effort.”