Republican senators scrambling to protect President 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 from a formal impeachment inquiry are attacking the credibility of the whistleblower who filed a complaint.

GOP lawmakers are asserting the whistleblower did not have firsthand knowledge of the actions detailed in the complaint and question whether the person had a political agenda.

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“It doesn’t come from a person with personal knowledge. It’s like I heard these people say this, and now I’m reporting it. I think that is pretty bizarre,” said Sen. John Cornyn John CornynHillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Lawmakers introduce legislation to boost cybersecurity of local governments, small businesses On The Trail: Making sense of this week's polling tsunami MORE (R-Texas).

“Secondly, after a certain point, it doesn’t just allege facts, it really is kind of a dossier or political diatribe, so I think there are plenty of reasons to be skeptical. Having said that, we are in the process of talking to the director of national intelligence and the inspector general.”

Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyGOP lawmakers distance themselves from Trump comments on transfer of power The Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Iowa), who has had a reputation for protecting whistleblowers, said the one at the center of the Trump impeachment inquiry didn’t necessarily deserve protections.

“If they are not really a whistleblower, they don’t get the protection,” he said.

The remarks from Grassley, Cornyn and other senators echo arguments coming from Trump, but stand in stark contrast to the testimony last week from acting Director of National Intelligence Joseph Maguire Joseph MaguireCongressional Democrats request FBI briefing on foreign election interference efforts Wells Fargo told employees to delete TikTok from work phones Hillicon Valley: Pompeo floats TikTok ban | Civil rights groups slam Facebook after call | Election security funding included in proposal MORE, who said the whistleblower acted in good faith.

“I think the whistleblower did the right thing,” Maguire told the House Intelligence Committee.

But Senate Judiciary Committee Chairman Lindsey Graham Lindsey Olin GrahamLincoln Project mocks Lindsey Graham's fundraising lag with Sarah McLachlan-themed video The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-S.C.) said reading the whistleblower’s complaint “makes me more suspicious about how all this happened.”

“I want to know who was the person that went to the whistleblower,” he said.

Graham said that whistleblowers typically report witnessing basic facts and firsthand evidence and raised concern about what some Republicans see as a not-so-subtle attempt to draw up a criminal indictment of Trump.

“This was a fairly sophisticated effort to write a narrative rather than blow a whistle,” he said.

A Senate Republican aide predicted that the whistleblower’s name will likely become public either because that person will agree to testify publicly or the name will leak to the press.

The attacks on the whistleblower come with high stakes, as GOP leaders see their political fate as closely tied to Trump’s in next year’s elections.

Several Republican lawmakers publicly and privately acknowledged over the past week that the content of the transcript of a July 25 call between Trump and Ukrainian President Volodymyr Zelensky, in which Trump urged Ukrainian officials to investigate Democratic presidential candidate 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, was damaging.

Sen. Mitt Romney Willard (Mitt) Mitt RomneyCrenshaw looms large as Democrats look to flip Texas House seat The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (R-Utah) called the transcript “troubling in the extreme” while Sen. Ben Sasse Benjamin (Ben) Eric SasseWhy a backdoor to encrypted data is detrimental to cybersecurity and data integrity McEnany says Trump will accept result of 'free and fair election' McConnell pushes back on Trump: 'There will be an orderly transition' MORE (R-Neb.), who recently secured Trump’s endorsement for reelection, warned “there’s obviously lots that’s very troubling here.”

A handful of Republicans have expressed shock that Trump released the transcript of the president’s conversation with Zelensky and an unredacted version of the whistleblower complaint, fearing it gave Democrats ammunition.

A GOP senator who requested anonymity to discuss party strategy said that White House officials and GOP leaders decided the damaging information was likely to become public anyway and thought the best strategy was to get it out early so Republicans could then have a chance to wage a counteroffensive.

“This was all going to become public. The thought was the sooner it does, the better. Get it all out quickly,” the lawmaker said.

And other Republicans offered other surprise defenses of Trump.

Sen. John Kennedy John Neely KennedyMORE (R-La.) compared Trump’s conduct to a police officer who beats up a suspect while arresting them.

“This is the way I analyze this ... I look at this like a guy robs a bank and on the way to jail the cops beat the bejesus out of him.” Kennedy said. “Should cops beat the bejesus out of suspects? No. Should it be investigated? Yes. But you can’t ignore the alleged bank robbery either."

As part of that counteroffensive strategy, Republican lawmakers have sought to shift the public focus off of Trump and onto Biden.

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House Minority Leader Kevin McCarthy Kevin Owen McCarthyHouse to vote on resolution affirming peaceful transition of power Ginsburg becomes the first woman to lie in state in the Capitol McCarthy says there will be a peaceful transition if Biden wins MORE (R-Calif.) told reporters Thursday that it was perfectly acceptable for Trump to ask Zelensky to participate in a Department of Justice investigation of what role Biden and his son Hunter Biden, a paid board member to a Ukrainian gas company, might have had in quashing a Ukrainian corruption investigation.

Sen. Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' The Hill's 12:30 Report: Ginsburg lies in repose CHC leaders urge Senate to oppose Chad Wolf nomination MORE (R-Wis.) said Trump has a responsibility “as the head law enforcement official of the nation” to delve into efforts by U.S. officials to interfere in foreign corruption investigations and to probe efforts from abroad to interfere in U.S. elections.

One of the controversial subjects Trump alluded to in his conversation with Zelensky was an allegation that a Russia-orchestrated hacking of the Democratic National Committee in 2016 was conducted in Ukraine. There has been little evidence to substantiate that claim.

Johnson sees Trump’s interest in Biden’s Ukraine connections and Ukraine’s alleged role in meddling in the 2016 election as legitimate law enforcement interests.

GOP leaders have sought to tamp down criticism of Trump from their ranks, mindful that that unity among rank-and-file members is crucial to maintaining their political strength, a point that Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE (R-Ky.) frequently makes to colleagues.

Graham, one of Trump’s staunchest allies, told reporters on Wednesday that Romney was the only senator to voice concerns about Trump’s conduct at a private lunch meeting of the Senate Republican Steering Committee.

And Sen. James Inhofe James (Jim) Mountain InhofeOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds Democrats push to limit transfer of military-grade gear to police Chamber of Commerce endorses McSally for reelection MORE (R-Okla.), another Trump ally, sought to portray Romney as a disgruntled outlier. “Mitt Romney doesn’t like the president and he’s going to say a lot of things I don’t agree with,” he said.

The White House in recent days has worked closely to coordinate its defense with allies on Capitol Hill.

A White House aide accidentally sent a copy of its talking point for Republican lawmakers to Democratic offices on Wednesday.

The document argued that Trump made no quid-pro-quo request to Zelensky and discussed Biden only after Zelensky initiated the conversation about corruption-related issues.

The talking points also shifted scrutiny to the whistleblower by arguing the “real scandal” was that Trump’s confidential conversation with a foreign leader was leaked to the press.

The document reflected Johnson’s argument that it was proper for Trump to ask a foreign leader to investigate any connection between his country and attempted interference in the 2016 election.

Republicans strategists acknowledge their prospects in the 2020 election, when control of the Senate as well as the White House and House will be up for grabs, are closely tied to Trump’s.

A Republican strategist working on a congressional campaign in Iowa said that, for example, while Sen. Joni Ernst Joni Kay ErnstOn The Trail: Making sense of this week's polling tsunami Tillis appears to reinforce question about COVID-19 death toll The power of incumbency: How Trump is using the Oval Office to win reelection MORE (R-Iowa), who is up for reelection, has a strong independent brand and could outperform Trump by a few points, she would likely lose if Trump lost her state by 5 points or more.

Ernst has said the investigation of the whistleblower’s complaint should be handled on a bipartisan basis by the Senate Intelligence Committee.

Another GOP tactic has been to portray the Democrats as dead-set on impeachment regardless of what any investigation of the whistleblower’s complaint turns up.

This line of argument has been spearheaded by McConnell.

“We know that House Democrats have been indulging in their impeachment obsession for nearly three years now, a never-ending impeachment parade in search of a rationale,” he said on the Senate floor the morning after Speaker Nancy Pelosi Nancy PelosiDemocratic senator to party: 'A little message discipline wouldn't kill us' Overnight Health Care: New wave of COVID-19 cases builds in US | Florida to lift all coronavirus restrictions on restaurants, bars | Trump stirs questions with 0 drug coupon plan Overnight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds MORE (D-Calif.) announced the launch of a formal impeachment inquiry.

McConnell pointed out that on the day of Trump’s inauguration, The Washington Post ran a headline stating, “The campaign to impeach President Trump has begun.”