As House Democrats debate whether, how, how quickly and how broadly to bring impeachment charges against President Donald Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE, it helps to consult a uniquely qualified observer: Bill Cohen.

He served almost a quarter century as a Republican congressman and senator from Maine, and then as President Bill Clinton William (Bill) Jefferson ClintonHarris: Ginsburg 'absolutely' cleared the path for me Anxious Democrats amp up pressure for vote on COVID-19 aid Barr's Russia investigator has put some focus on Clinton Foundation: report MORE's Defense Secretary. He now is one of Washington's wise men. The first bookend was in 1974 when, as a freshman House member, he played a crucial role in the Judiciary Committee's deliberations on impeaching Richard Nixon — still, for all the differences, the best model for the Trump inquiry.

As a reporter covering the House and spending a good deal of time at the Judiciary Committee in 1974, I have a special appreciation of Cohen's insights and the differences between then and now.

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In an interview, Cohen — a strong proponent of impeachment — says the House should soon pass a formal inquiry as it did in 1974; it's not required, but he notes it offers more legitimacy and takes away opponents’ talking points.

The House then should complete any process before the 2020 election year, but Cohen cautions this has to be a thorough and credibly comprehensive effort: "They should cancel all vacations, if necessary, between now and the rest of the year. They need to call a number of witnesses to elicit more information and determine if those that refuse to appear are part of any cover-up."

It's critically important, the former Maine lawmaker notes, "to build a public case, to build a record." After Trump's call to shake down the Ukrainian President to investigate Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, a potential rival for Trump in the 2020 presidential election, public opinion has shifted to more favorably view impeachment; that support, however, remains very soft.

That was true in early 1974 too, Cohen recalls. And a number of Republicans, including Mississippi's Trent Lott, who went on to become Senate Majority Leader, were as intransigently opposed to impeaching Nixon as Jim Jordan James (Jim) Daniel JordanHouse panel pulls Powell into partisan battles over pandemic Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election House passes resolution condemning anti-Asian discrimination relating to coronavirus MORE and Devin Nunes Devin Gerald NunesOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Trump nominates former Nunes aide to serve as intel community inspector general Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE are in the tank for Trump today.

The Ukrainian scandal is the easiest for the public and politicians to grasp and will be the centerpiece of any impeachment bill. The former House Judiciary Committee member argues there should be several articles dealing with abuse of power and obstruction of justice and should include a multitude of impeachable offenses.

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The current House Judiciary Committee has botched this task, but Cohen is impressed with House Intelligence Committee Chair Adam Schiff Adam Bennett SchiffSchiff to subpoena top DHS official, alleges whistleblower deposition is being stonewalled Schiff claims DHS is blocking whistleblower's access to records before testimony GOP lawmakers distance themselves from Trump comments on transfer of power MORE — despite the California Democrat's faux pas in engaging in hyperbole at an initial forum last month: "Schiff is a gifted lawyer,” said Cohen. “If this gets to the Senate, you want him to be the chief prosecutor."

I agree, with a caveat: Schiff should stay off cable television for now; he has a much more serious responsibility; others can air the public case with the talking heads.

Any of us who covered the historic 1974 impeachment see significant differences. First, a year before, the Sam Ervin-led Senate Watergate Committee had established a record, including the existence of White House tapes and the devastating testimony of former Nixon counsel John Dean. In a narrower sense, the Mueller report laid out demonstrably impeachable offenses — but it was less conclusive.

Other than the rough transcript the White House released of the call to the Ukrainian leader, this time there are no tapes — yet.

Another difference is that social media and cable television generate a more polarized politics, one reason the partisan lines are drawn more sharply today.

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On the other hand, impeachment was a more alien concept going into 1974; there had been no such move against a president in over a century. Conceptually, it's less unthinkable today. During Watergate even some critics acknowledged some of Nixon's governing skills — and worried over that loss. There is no such concern today.

There are those who argue why go through this ordeal if a conviction in the Republican Senate is out of the question? That's repeating the mistakes made in the flawed impeachment against Bill Clinton. (Nixon resigned before facing certain defeat in both houses.)

Cohen rejects the argument:

"This is presidential conduct you want to be ashamed of. He is corrupting institutions, politicizing the military, and acts like he is the law. If that is acceptable, we really don't have a Republic as we've known it any more."