The Mueller inquiry: Trump's problem is that the sum is greater than the sleaze of its parts

As Mueller time approaches, it is likely that President Donald Trump's defense will consist of two phrases: "But that is not illegal" and "But that is not impeachable."

It is a strategy that prevails by the lowering of standards. Because Trump did not plot election fraud directly with Russian President Vladimir Putin by Skype, and because Trump's various crimes and misdemeanors do not constitute high crimes and misdemeanors, the president is vindicated. Unable to make the case for his own virtues, Trump must aver that his vices are commonplace and inconsequential.

Will this work? If the only standard of success is keeping enough Republican votes in the Senate to avoid Trump's removal from office, it may.

It is now fully demonstrated that the Russian attack on the 2016 election was broad, ambitious and designed to give Trump practical aid. Russian intelligence fed ideological and racial tensions in a sophisticated attempt to arouse enthusiasm in Trump's base and dampen enthusiasm for Hillary Clinton among minority voters.

Did this tilt the election toward Trump? If political circumstances were reversed — if Clinton had received Russian help to become president — every Republican would see a conspiracy that undermined her legitimacy. Every. Single. One.

The Russians seem to have exploited a national weakness without invalidating the election itself. They really didn't need to go very far to find a template. In inciting racial and ethnic tensions through obvious propaganda for the benefit of Trump, Russian intelligence was simply following the Fox News business model.

Does it make a difference if special counsel Robert Mueller describes extensive contacts between Russian officials and the Trump campaign? Or that senior campaign officials systematically lied about those contacts? We have known of such cooperation and such lying for years. Will it make a difference if Mueller reveals corrupt business dealings between Trump-owned companies and Russian oligarchs? It certainly helps explain why Trump was an obvious politician to favor. He holds the oligarch's view of business integrity. He supports the oligarch's view of economics, in which outcomes are determined by family-run cartels that have taken over the levers of government. But unless Russian intelligence is actually blackmailing Trump, I'm not sure that suspicious, or even corrupt, dealings with the oligarchs are unexpected.

For the rest of us, the deal hasn't worked out so well. A deeply compromised American administration has been unable to effectively counter a direct attack on our democratic institutions by a hostile foreign government — responding to a digital Pearl Harbor with a wink and a nod. "This is an existential constitutional crisis," says historian Jon Meacham, "because it's quite possible that the president of the United States right now is a witting or at least partially witting agent of a foreign power."