Senators offered sharp reactions to reports that President Trump disclosed highly classified material to Russian officials during a recent meeting at the White House. (May 15, 2017) (Sign up for our free video newsletter here)

The question is no longer whether there are grounds to impeach Donald Trump. The question is when enough Republicans will put their loyalty to America ahead of their loyalty to their party.

Mr. Trump's statements last week about his firing of former FBI Director James Comey provide ample evidence that Mr. Trump engaged in an obstruction of justice -- a major charge in impeachment proceedings brought against Richard Nixon and Bill Clinton.

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It's worth recalling that the illegality underlying Nixon's impeachment was a burglary at the Watergate complex, while the illegality underlying Clinton's was lying to a grand jury about sex with an intern in the White House.

Mr. Trump's obstruction is potentially far more serious. It involves an investigation into whether Mr. Trump or his aides colluded with Russia in rigging a presidential election -- which would be the most direct assault on American democracy in history.

Last Thursday, in an interview with NBC's Lester Holt about his firing of Comey, Mr. Trump said: "I was going to fire regardless of recommendation." Mr. Trump also said that he had pressed Mr. Comey during a private dinner to tell him if he was under investigation.

Mr. Trump conceded that the ongoing investigation into Russian influence on the 2016 election, which includes a probe into the possibility that Moscow was coordinating with the Trump campaign, was one of the factors he considered before firing Mr. Comey.

"In fact, when I decided to just do it, I said to myself, I said, 'You know, this Russia thing with Trump and Russia is a made-up story, it's an excuse by the Democrats for having lost an election that they should have won,' " Mr. Trump said.

The law is reasonably clear. If Donald Trump removed Jim Comey to avoid being investigated, that's an obstruction of justice -- an impeachable offense.

On Friday, Mr. Trump tweeted that Mr. Comey "better hope that there are no 'tapes' of our conversations before he starts leaking to the press!"

Here, the law is also clear. Seeking to silence, intimidate or even influence someone who is likely to offer evidence in a congressional or criminal proceeding is also an obstruction of justice -- and an impeachable offense.

As a practical matter, though, nothing will happen until a majority of the House decides on bringing a bill of impeachment. Which means that 23 Republicans would have to join with House Democrats to put enough pressure on the Speaker of the House to allow such a bill to be considered.

The odds of this occurring in this Congress, under present circumstances, are approximately zero.

So, barring a "smoking gun" that shows Mr. Trump's complicity with Russian operatives in interfering in the 2016 election, Mr. Trump's fate seems to hinge on the midterm elections of 2018.

Those elections are less than 18 months away. That's a long time in American politics. Under a Trump presidency, it's an eternity.

But there's another possibility.

In my experience, most elected politicians have two goals: to do what they consider to be the right things for the American public, and to be re-elected (not necessarily in that order).

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If Mr. Trump's poll numbers continue to plummet -- particularly among Republicans and Independents -- 23 House Republicans may well decide their chances for being re-elected are better if they abandon him before the 2018 midterms.

House Speaker Paul Ryan and the House Republican leadership might make a similar calculation, at least enough to put a bill of impeachment on the table.

Most House Republicans prefer Vice President Mike Pence to Mr. Trump anyway. As one said to me several months ago: "Pence is a predictable conservative. Trump is an unpredictable egomaniac. Most of us are more comfortable with the former."

There's a good chance Mr.

Trump's poll numbers will continue to fall. First, he's proven to be his own worst enemy. Even when things are going reasonably well, he seems bizarrely intent on stirring controversy -- and on saying or tweeting things that get him into trouble.

There's also a matter of the economy. The expansion that began in 2009 is getting long in the tooth. If history is any guide, we're due for a slowdown or recession. And justified or not, presidents get blamed when Americans lose jobs.

Mr. Trump doesn't have the character or the temperament to be president of the United States. But this obvious fact isn't enough to get him fired.

He'll be fired when enough Americans decide they can't abide him anymore.

Then, maybe in an impeachment proceeding, it will come out that Mr. Trump did something incredibly stupid -- like give a nod of approval to one of his campaign bottom feeders to tell a Russian operative to go ahead with their plan to interfere in the 2016 election.

The House impeaches. The Senate convicts. That's the end of Trump.

Robert Reich, a former U.S. Secretary of Labor, is professor of public policy at the University of California at Berkeley and the author of "Saving Capitalism: For the Many, Not the Few," now available in paperback. His new film, "Inequality for All," is now out on Amazon, DVD and On Demand. His daily blog is at www.facebook.com/RBReich/.

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