No presidential administration is completely free from questionable ethics practices, but Donald Trump has pushed us to a new low. He has accomplished that by breaking every norm of good government, often while enriching himself, whether by pardoning a convicted felon who, together with his wife, donated $1.8 million to the Trump campaign; promoting Teslas on the White House driveway; or holding a private dinner for speculators who purchase his new cryptocurrency.

Mr. Trump’s blatant transgressions have swamped those of any modern president and even those of his first term. Remember the outrage when he refused to divest his financial holdings or when he used a Washington hotel he owned as a kind of White House waiting room? Those moves seem quaint in comparison.

In his trampling of historically appropriate behavior, Mr. Trump appears to be pursuing several agendas. Personal enrichment stands out: Imagine any other president collecting a cut of sales from a cryptocurrency marketed with his likeness. There is the way he is expanding his powers: He has ignored or eliminated large swaths of rules that would have inhibited his freedom of action and his ability to put trusted acolytes in key roles. And then there’s rewarding donors, whether through pardons or favors for their clients.

I was working in the Washington bureau of The Times when Richard Nixon resigned, and even he — taken down by his efforts to cover up his misdeeds — did not engage in such a vast array of sordid practices.

The corruption of Trump 2.0 has not gotten the attention it deserves amid the barrage of news about Mr. Trump’s tariff wars, his attack on scientific research and his senior appointees’ Signal text chains. But self-dealing is such a defining theme of this administration that it needs to be called out. Like much that Mr. Trump has done in other areas, it announces to the world that America’s leaders can no longer be trusted to follow its laws and that influence is up for sale.

Just as in the post-Nixon era, when guardrails were established to prevent transgressions, the next president could decide to restore some of the sound government practices that Mr. Trump has trampled on. But the damage he has inflicted by, say, pardoning his donors or lining his own pockets is irreversible.