Right or wrong, why did president fire Comey now?

The news that President Trump has fired FBI Director James Comey left me — it should leave all Americans — feeling more than “mildly nauseous.”

That was the memorable phrase Comey used last week to describe his feeling that his fateful letter to Congress about Hillary Clinton’s emails might have influenced the election. Then, it was infuriating. Mildly nauseous? Some of us — maybe thanks to you — have woken up feeling that way every day since the election.

But firing an FBI director — now? With the bureau in the midst of an investigation that could determine the destiny, political if not criminal, of the president who canned him?

To be clear: Like many people, I once was and no longer count myself a Comey fan. Comey’s pre-election letter was nothing short of outrageous. It seemed more aimed at insulating Comey’s agency from criticism and — more to the point — burnishing his well-polished reputation for probity, all at the expense of electoral fairness.

If I were president, I might have considered firing Comey myself.

Thus, the newly installed — and by all accounts, resolutely nonpartisan — deputy attorney general, Rod Rosenstein, had some undeniable points in his memorandum advocating Comey’s dismissal. Indeed, the FBI’s “reputation and credibility have suffered substantial damage” from Comey’s actions. As Rosenstein pointed out, there was “nearly universal judgment” among former Justice Department officials — Democratic and Republican appointees alike — that Comey’s intervention was an appalling departure from standard practice.

So if, say, President Barack Obama had fired Comey after the election, that would have been huge news. But not nauseating news. Not news that prompted, as did Tuesday’s action, words like “Nixonian” and “cover-up.” Those were from Democrats, but, notably, some key Republicans were unwilling to simply salute. They included Senate Intelligence Committee Chair Richard Burr, who said he was “troubled by the timing and reasoning” of the action.

Because firing Comey now is different. It is different because nothing significant has changed since Inauguration Day in terms of the reason cited for Comey’s firing — his handling of the Clinton emails. (Seriously, we are supposed to believe that the straw that broke Trump’s back was that Comey was inaccurate unfair to, of all people, Huma Abedin?)

What has changed is that we now know the FBI is pursuing a serious investigation into Russian intervention in the election and potential entanglements with the Trump campaign, an investigation that could pose a mortal political, if not criminal, threat to Trump’s presidency.

Indeed, the untenable nature of Trump’s conflict was encapsulated in his own dismissal letter to Comey.

Think about this, the sitting president of the United States announcing that he is not a crook — well, in his telling, not a suspected crook — as he fires the man who has been leading the investigation of his presidential campaign’s possible involvement with Russia.

If people aren’t buying Trump’s asserted rationale, it is because Trump made this bed of distrust. Nothing in his conduct offers comfort that he understands the importance of the independence of the Justice Department. Nothing suggests that he takes seriously the gravity of Russian intervention in the election or wants to get to the bottom of the mess.

Trump’s priority is, first and always, Trump. Which raises the question: Knowing, as he must have, that dismissing Comey would set off a firestorm, why did he calculate that this move was in his self-interest?