Trump's impeachment drama is not that different from Nixon's

While there's huge interest in the public impeachment hearings set to begin next week in the U.S. Congress, they'll have a tough time topping themonster ratings and classic politicalsoundbites produced by Watergate in the early1970s.

A TV critic with the L.A. Times in 1973 called those hearings the best thing to happen to public televisionsince Sesame Street. It was such a hot-ticket event that the list of spectators angling for seats in the public gallery includedJohn Lennon and Yoko Ono.

Ample attention has been lavished on how different this era is from Watergate which is understandable, given how remote the chances seem of U.S. President Donald Trump being forced to resign by members of his own party,the way Richard Nixon was.

But there are numerous parallels between the eras televised impeachment hearings are just one item on that list.

Here are seven similarities illustrating that even when history doesn't quite repeat itself, it can still rhyme:

Pardon power

With his Republican White House beset by investigations into the 1972 break-in at Democratic Party headquarters inside D.C.'s Watergate complex, Nixon dangled the possibility of pardons in an effort to keep witnesses from talking. He signalled through aideshis willingess to use the presidential pardon power to help the Watergate suspects who stayed silent.

Trump has employed the same playbook, according tothe report by special counsel Robert Mueller into Russian interference in the 2016 U.S. election. Trump has already pardoned political allies, denounced co-operative witnesses as "rats" andrepeatedly refused to rule out pardoning former campaign aidesPaul Manafort and Michael Flynn.

The Mueller report said the evidence suggests Trump wants witnesses to believe he'll protect them if they get in trouble and refuse to co-operate with investigators or authorities.

Hush money

When Nixon heard from an aide that it might cost $1 million US to keep witnesses quiet, he replied that he knew where he couldget that money in cash. A Watergate grand jury named Nixon anunindicted co-conspiratorand sentevidence to Congress, unsealed last year, showing the president's awareness ofefforts to pay off witnesses.

Look no further than porn star Stormy Daniels for a modern-day example of illegal hush-money payments to help protect a president. Trump's longtime fixer Michael Cohen pleaded guilty to campaign-finance violations for arranging payments to Daniels, as well as to Playboy model Karen McDougal, so stories of their alleged affairs with Trump would stay silent during the 2016 election. In asentencing document, New York prosecutors said Cohen acted in co-ordination with, and at the direction of Trump, referred to as "Individual-1."

Democrats tiptoe toward impeachment

In the book Impeachment: An American History, Canadian-born historian Timothy Naftali writes that during the Nixon era,when, unlike now, Democrats controlled both the House of Representatives and the Senate,senior members of the party resisted impeachment for months.

Democratic leaders such as House Speaker Carl Albert and Majority Leader Tip O'Neill pushed back against intense pressure from liberals who wanted to launch proceedings. (They "found ways to keep the dogs of impeachment well leashed," Naftali writes.)

But the public mood turned after the so-calledSaturday Night Massacre in October 1973, and Democrats followed suit. Even then, they sought to keep the process contained. Leadership entrusted control to the mild-mannered head of the House judiciary committee, New Jersey congressmanPeter Rodino, and it stiff-armed efforts from progressives who wanted to add lines of inquiry well beyond Watergate (such as the war in Vietnam).

WATCH | 'What did the president knowand when did heknow it?': One of the most famous quotes to come out of the Watergate hearings was uttered by Howard Baker, the Republican co-chairman of the Senate committee holding the hearings:

Current House Speaker Nancy Pelosi'sreluctance to launch impeachment proceedings against Trump is well documented. The House speaker called the idea too divisiveand spent months resistingdemands for it from her party colleagues. That changed with revelations suggesting Trump tried to bully Ukraine into investigating his potential election rival, Joe Biden and his son Hunter in exchange for U.S. aid.

Pelosichanged her tune, accusing Trump of betraying the country, undermining its elections and breaking his pledge to uphold the nation's laws by withholdingfunds approved for Ukraine.

Attacking the whistleblower

Nixon flipped his lid on the aide who flipped. When his White House counsel, John Dean, began co-operating with investigators,Nixon ordered aides to "draw the sword" on him and slam him as a "traitor" and "turncoat" and do it in a "brutal" fashion. Dean got so much hate mailand so many death threatsthat theWitness Security Programof the U.S. Marshals Service guarded his house for over a year.

"He literally had to go into the witness-protection program," said Dean's friend James Robenalt, a presidential historian and lawyer who partners with Dean in deliveringlectures on Watergate. "They went after him hammer and tongto try to discredit him."

Trump has tweetedat least 55 times about the whistleblowerwho raised concerns about the president's call with Ukrainian President Volodmyr Zelensky and demanded numerous times that his identity be revealed. Thepresident's son tweeted an article purporting to reveal the identity.

A Trump ally, Sen. Rand Paul, isthreatening to reveal the whistleblower's name. Trump-friendly media havepointed out that the whistleblower's lawyer detests the president and tweetedtwo years ago about impeaching him. Trump has also levelledmilder threats against a member of his White House staff, Alexander Vindman, who testified in the Ukraine congressional probe.

WATCH | Republican SenatorRand Paul has threatened to reveal the whistleblower's name:

Fake co-operation

Naftali writes in his book that Nixon's game plan was to pretend to co-operate with the House probe. In the meantime, Nixon's team was working to undermine it, putting pressure on House Democrats to wrap up the process, claiming it was hurting the economy and fighting the release of documents all the way tothe Supreme Court.

Nixon wrote to one aide in March 1974 that the affair was primarily a public relations fight, not a legal one, and the winner would determine the impeachment outcome.

Trump is overtly dismissive of the impeachment probe, and a number of Trump allies haverefused to testify. The strategy of discrediting while co-operating slightly could describe his approach to the Russia probe. The Mueller reportlists 11 ways the president tried to undermine the investigation.

Trump has warned that impeachment willhurt the economyand now says his fight against the impeachment probe will probably wind up asa Supreme Court case. Legal analysts sayseveral disputes over whether documents related to Trump and his administration must be released to Congress, includinghis taxes, are heading for the high court.

CIA and FBI in the mix

Intelligence and law-enforcement agencies got pulled into the Watergate affair. Nixon was ultimately done in by the"Smoking Gun Tape," a recording in which he's overheard plotting to have the CIA warn the FBI to back off the Watergate investigation, using the pretext that it would uncover the secrets of CIA operative-turned-Watergate plotterHoward Hunt.

Support for Nixon disappeared with the release of that tape, and he resigned three days later.

Trump insists his political problemsstarted with the CIA. He accusesformer CIA director John Brennan of using unfair tactics to launch the Russia investigation. Trump's effort to push back on the idea that Russia helped him in 2016 was a key theme in his conversation with Zelensky. It's actually what Trump was talking about when he asked Zelensky for"a favour" and it could lead to his impeachment. Trump alsofired the head of the FBI, James Comey.

Republicans close ranks

When the scandal first erupted, Nixon had rock-solid support from Republicans. The polling agency Gallup says its data shows a mere six per cent of Republican supporters wanted Nixon impeached in June 1973, after public hearings had begun. ("Very similar to Trump," said Jeff Jones, senior editor at Gallup, in a recent interview.)

That grew to 12 per cent by December, 20 per cent by June 1974 and 31 per cent in early August, when WashingtonRepublicans told Nixon he'd have to quit or be impeached. His support had also tanked among independents, and Republicans were worried about the impending midterm elections.

Polls have shown independent voters turning on Trump, and their votes will matter in next year's election. But Republicans, who control the Senate, control the impeachment outcome, and Republican voters haven't budged.

Republican support for impeaching Trump showedsome sign of growing with news of the Ukraine scandal, but it's settled at just over 10 per cent. Removing Trump from office, if he's impeached by the Democratic-led House of Representatives,would require about 20 votes from Republicansin the Senate, where an impeachment trial would take place. There's no sign of that happening.

Not a single Republican voted to launch the impeachment process in the House last week.

How hard is it to impeach a president?

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Duration 2:01

Impeachment is the political process of removing from office certain elected or public officials accused of wrongdoing. The process is more difficult than you might think.