Here’s the bottom line: What will it take to get to 20?

That’s the number of Republican senators who would need to join with 47 Democrats to reach the 67 votes to convict and remove President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE.

But first, what will it take to get to four?

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That’s the number of Republican senators who would need to join with the Democrats to get witnesses and documents introduced at Trump’s impeachment trial.

Four Republican votes is a low bar to avoid a sham trial. But Trump has defined membership in the GOP as a matter of loyalty to him above all.

At the moment, that means a Republican has to be blind to all evidence that Trump broke the law.

The Government Accountability Office confirmed that Trump did break the law when he used U.S. foreign aid to try to pressure Ukraine’s new president into announcing an investigation into a potential Trump political rival, former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE.

But Trump continues to say his call with the Ukrainian president was “perfect,” and claims that impeachment is a “hoax.”

So what will it take for Senate Republicans to have the scales fall from their eyes? What will it take for them to consider that the president deserves impeachment and removal?

Let’s begin with the voters.

Last week a majority of voters, 51 percent, said they approve of the House impeaching Trump, according to a Quinnipiac University poll. As of Saturday, the RealClearPolitics average of polls had 46.9 percent support for the Senate removing Trump from office.

Four Republican senators already seem concerned that they will be seen as allowing a sham trial for Trump: Sens. Mitt Romney Willard (Mitt) Mitt RomneySenate Republicans face tough decision on replacing Ginsburg McConnell says Trump nominee to replace Ginsburg will get Senate vote GOP-led panel to hear from former official who said Burisma was not a factor in US policy MORE (Utah), Lisa Murkowski Lisa Ann MurkowskiSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (Alaska), Susan Collins Susan Margaret CollinsSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (Maine) and Lamar Alexander Andrew (Lamar) Lamar AlexanderChamber of Commerce endorses McSally for reelection Trump health officials grilled over reports of politics in COVID-19 response Now is the time to renew our focus on students and their futures MORE (Tenn.).

A Morning Consult/Politico poll taken this month found that 57 percent of registered voters — 71 percent of Democrats, 56 percent of independents and 40 percent of Republicans — say the GOP-controlled Senate should allow witnesses to testify at the impeachment trial.

Murkowski told an Alaska TV station last month she was “disturbed” by Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE’s (R-Ky.) pledge to coordinate the Senate impeachment trial with the president’s lawyers.

“For me to prejudge and say ‘There's nothing there,’ or on the other hand, ‘He should be impeached yesterday,’ that's wrong, in my view, that's wrong,” she added.

Sixty-six percent of registered voters want to see former National Security Advisor John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE testify, according to a January poll by Quinnipiac University.

So, let’s count the four senators who are open to witnesses as perhaps also being open to Trump’s removal, if the testimony is damaging.

Then there are Republicans trying to win reelection in states where Trump is not popular.

Maine’s Collins fits into that category as does Sen. Cory Gardner Cory Scott GardnerSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Chamber of Commerce endorses McSally for reelection MORE (R-Colo.).

In addition to those five Republicans, there are three GOP senators running in swing states where they have to worry about being labeled as Trump acolytes if an anti-Trump backlash stirs up a big turnout of Democrats in November.

Those three are Sens. Joni Ernst Joni Kay ErnstWhat Senate Republicans have said about election-year Supreme Court vacancies Chamber of Commerce endorses McSally for reelection Senators offer disaster tax relief bill MORE (Iowa), Martha McSally Martha Elizabeth McSallySenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (Ariz.) and Thom Tillis Thomas (Thom) Roland TillisWhat Senate Republicans have said about election-year Supreme Court vacancies Chamber of Commerce endorses McSally for reelection Airline job cuts loom in battleground states MORE (N.C.).

Now add three more Republican senators who are about to retire. They are less vulnerable to intimidation by Trump since they are leaving the political stage.

Alexander — whom I’ve already counted — leads this group, which also includes Sens. Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (N.C.), Mike Enzi Michael (Mike) Bradley EnziChamber of Commerce endorses McSally for reelection Cynthia Lummis wins GOP Senate primary in Wyoming The Hill's Convention Report: Democrats gear up for Day Two of convention MORE (Wyo.) and Pat Roberts Charles (Pat) Patrick RobertsThe Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill GOP senators say coronavirus deal dead until after election Trump says he'll sign USPS funding if Democrats make concessions MORE (Kan.).

That makes 11 possible votes to convict, taking us more than halfway to the 20 GOP votes necessary to remove Trump.

Now there is another element to consider — the political grudge.

There are way more than nine GOP senators who have been insulted, berated, demeaned and threatened by Trump since he ran for president.

Here’s a good example: Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.), the loudest advocate for a restrained U.S. foreign policy and a recent critic of Trump’s action against Iran.

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Trump once tweeted: “Truly weird Senator Rand Paul of Kentucky reminds me of a spoiled brat without a properly functioning brain.”

Then there’s Sen. Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE (R-Texas).

Trump famously suggested Cruz’s father was involved in the assassination of President Kennedy. He also insulted the senator’s wife and threatened to “spill the beans” about her.

By the way, there is no love lost between Trump and Murkowski.

After the Alaskan voted against the GOP’s ObamaCare repeal bill, Trump tweeted that she “really let the Republicans, and our country, down yesterday. Too bad.”

I’m reminded of a Wall Street Journal piece from last year about Trump defenders who ended up being damaged by covering up for his wrongdoing — men such as National Enquirer publisher David Pecker and lawyer Michael Cohen Michael Dean CohenA huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr Eric Trump says he will comply with New York AG's subpoena only after Election Day MORE.

“They pledged fealty to Mr. Trump and dedicated themselves to shielding him,” the Journal wrote. “For a while, they became wealthier and more powerful through their association with him. But Mr. Trump ultimately offered little back in protection or respect.”

The 20 votes may be there.

Juan Williams is an author, and a political analyst for Fox News Channel.