“Politicians lie, but this is different,” says a historian who studies presidential history and estimates the Trump administration easily ranks among the most corrupt in American history.

Robert Dallek is a presidential historian and the author of several books... Dallek estimates that historical examples of corruption, like that of the Warren G. Harding administration, don’t hold a candle to how Trump and his people have conducted themselves in the White House....

"This administration is a low point in our history. We’ve been through scandals before, going as far back as the Grant administration in the 19th century and the Harding administration in the early 20th century. Presidents have been accused of bribery and shady gift-giving. So it’s not entirely unique to see scandals subsume a White House.

But the shamelessness of this administration, the dishonesty, the total indifference to facts, is something I haven’t seen before — at least not this blatant."

...Q. "Is this the most dishonest administration you've ever seen or studied?"

A. The short answer is yes. Politicians lie, but this is different. I suppose if you wanted to be generous, you might say this is the least effective and trustworthy administration since Warren G. Harding, whose administration was overwhelmed by the Teapot Dome scandal in 1921, in which Harding’s secretary of the interior leased Navy petroleum reserves in Wyoming and California to private oil companies at incredibly low rates without a competitive bidding process. That was a massive scandal, one of the biggest we’ve seen at the level of politics.

There are other examples, of course. Most obviously, there’s Nixon and Watergate, which was a watershed moment in American political history. Ulysses S. Grant’s reputation as a Civil War general was shattered by the Whiskey Ring scandal in 1875, in which Treasury officials basically stole tax dollars from alcohol distillers. Other presidents, like Bill Clinton, have lied shamelessly as well.

Still, I think what we’re seeing right now will, eventually, rise above these examples, with the possible exception of Watergate"...

Q. "What, exactly, is so unique about this administration in terms of the corruption and the graft?"

A. "Obviously the examples of corruption are numerous: Trump refused to divest from his business interests; there are questions about whether he’s violating the emoluments clause by running Trump International Hotel in DC; there’s the indictment of his former campaign manager Paul Manafort; there’s the looming indictment of his former national security adviser Michael Flynn; Jared Kushner, Trump’s son-in-law and adviser, failed to disclose $1 billion in loans connected to his real estate company; and of course several of his Cabinet heads are being investigated for profligate travel expenses.

But here’s what I think is unique: Often you see a lot of corruption result from a lack of oversight, but I think this administration is quite different in that Trump really sets the tone for all this. He encourages it, really. The fish rots from the head, and the stench of this administration starts at the very top."