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WASHINGTON — Since Thomas Jefferson’s concubine, Warren Harding’s love nest and Bill Clinton’s innovative intern program, Americans have debated the role of character in leadership. But the concept of character has often been defined too narrowly. Sexual ethics — involving a range of behaviors from doomed longing to cruel exploitation — is a part of it, but not the largest part. “The sins of the flesh are bad,” wrote C.S. Lewis, “but they are the least bad of all sins. All the worst pleasures are purely spiritual: the pleasure of putting other people in the wrong, of bossing and patronizing and spoiling sport, and back-biting; the pleasures of power, of hatred.”

Republicans are beginning to see that the main problem with their presumptive nominee is not his lack of basic knowledge or his inability to stay on the script of sanity for 10 minutes at a time. The problem is Donald Trump’s public character, which no amount of last-minute coaching can change.

Trump’s instincts were on full display in his reaction to the Orlando terrorist attack. There was a pronounced lack of empathy for victims. There was a resort to insanely partisan conspiracy theories — including insinuations that President Obama is the Manchurian Muslim. There was an almost gleeful credit grab in asserting that his accusations about the violent nature of Islam were vindicated.