Editorial: What’s past is prologue

The FBI’s search of and seizure of documents from Donald Trump’s Mar-a-Lago resort in Florida is not only dramatic and serious, but unprecedented: no other former president has faced such an action. Yet Mr. Trump’s ability to survive and thrive politically on similar moments is also without precedent. Even when damaging evidence emerges, he has walked away largely unscathed in the eyes of his base, while the U.S. itself has been diminished. Nor has he yet experienced legal consequences for his actions in office.