For seven months, President Donald Trump giddily has ignored the norms of his office and tried the patience of those who had more than a passing knowledge of its history.

But during Tuesday’s press conference, before the gold-plated bank of elevators inside his Midtown temple to himself, the President defended those linked to white nationalists, neo-Nazis and other racist corners of American society in a display that defied any historical precedent. So striking was his bold protection of a small but vocal part of his political base, many reporters in the marble foyer dared to interrupt the President. If he was breaking with custom, so, too, would they.