All that has changed with Mr. Trump as president. For Republicans, honor and integrity are now passé. We saw it again last week when the president’s longtime lawyer Michael Cohen — standing in court before a judge, under oath — implicated Mr. Trump in criminal activity, while his former campaign chairman was convicted in another courtroom on financial fraud charges. Most Republicans in Congress were either silent or came to Mr. Trump’s defense, which is how this tiresome drama now plays itself out.

It is a stunning turnabout. A party that once spoke with urgency and apparent conviction about the importance of ethical leadership — fidelity, honesty, honor, decency, good manners, setting a good example — has hitched its wagon to the most thoroughly and comprehensively corrupt individual who has ever been elected president. Some of the men who have been elected president have been unscrupulous in certain areas — infidelity, lying, dirty tricks, financial misdeeds — but we’ve never before had the full-spectrum corruption we see in the life of Donald Trump.