Club for Growth may back a McCain primary challenger
© Greg Nash

The fiscally conservative Club for Growth is keeping a close eye on a possible primary challenge to Sen. John McCainJohn Sidney McCainSenate's defense authorization would set cyber doctrine Senate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions MORE (R-Ariz.), its president said Tuesday morning.

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"In Arizona, we will watch that carefully. We'll look at John's record and his score," Club for Growth President David McIntosh told The Hill during a Tuesday breakfast sponsored by The Christian Science Monitor.

Reps. David SchweikertDavid SchweikertFreedom Caucus backs three debt ceiling options Bipartisan lawmakers give blood in honor of Scalise GOP senators pleased with Ivanka Trump meeting on family leave, child tax credits MORE (R-Ariz.) and Matt SalmonMatt SalmonSchumer tells Sinema he's backing her in Ariz. Senate race Comey fallout weighs on the GOP Conservative activists want action from Trump MORE (R-Ariz.) have both told The Hill they're considering a challenge to McCain. Both Tea Party-leaning congressmen have been supported in the past by the group, which has also been critical of McCain.

"We'll see if either of the two members, you're right, they're people the Club's supported and thinks well of in Congress, does one of them decide to enter the race," McIntosh continued. "We'll do research including polling and determine, is there a path to victory and is the money well spent? And by a path to victory, some institutions only engage in things when they're 90 percent sure will lead to victory. The Club is willing to take greater risk. ... So that'll be an assessment we do in Arizona if the race materializes."

The Club has long been the biggest player on the right in GOP House and Senate primaries, and has helped elect a number of conservative Republican senators, including Marco RubioMarco Antonio RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE (Fla.), Rand PaulRandal (Rand) Howard PaulSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Lawmakers grapple with warrantless wiretapping program MORE (Ky.) and Ted CruzRafael (Ted) Edward CruzSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea GOP state lawmakers meet to plan possible constitutional convention MORE (Texas), a trio of likely presidential contenders.

McIntosh suggested that the Club is likely to not endorse in a presidential primary, though he said the group will continue to be vocal in criticizing those whose policies don't align with the Club's. He has already slammed former Arkansas Gov. Mike Huckabee, a longtime foe of the organization.

"If history repeats itself, we won't be endorsing a candidate for president," he said. 

The group has also taken the blame for backing primary challengers who flamed out in the general election — the Club helped defeat Sen. Richard Lugar (R-Ind.) in a primary in 2012, only to have its endorsed candidate, Richard Mourdock, blow the race against now-Sen. Joe DonnellyJoseph (Joe) Simon DonnellyGOP sees fresh opening with Dems’ single payer embrace Trump steps up courtship of Dems Trump having dinner with Schumer, Pelosi on Wednesday MORE (D-Ind.).

McIntosh said some of the other Republicans facing reelection that don't align completely with the organization aren't likely to face their wrath this time around.

He said, "nobody from Illinois has come to us" about challenging Sen. Mark KirkMark KirkStale, misguided, divisive: minimum wage can't win elections Immigration critics find their champion in Trump Trump's nominee to lead USAID has the right philosophy on international aid MORE (R-Ill.) and that the organization's primary objective is making sure it makes a "good investment" in backing someone who can win a general election, a sign it's unlikely to play in Democratic Illinois.

McIntosh, a former Indiana congressman, also described establishment-leaning Sen. Dan CoatsDaniel (Dan) Ray CoatsOvernight Cybersecurity: DHS bans agencies from using Kaspersky software | Panel calls Equifax CEO to testify | Facebook pulling ads from fake news Mueller investigation focusing on social media's role in 2016 election: report Intelligence director criticizes former officials for speaking out against Trump MORE (R-Ind.) as a "longtime political friend and ally," and said he hasn't heard "of a race materializing" against him.

When asked which senator he most wanted to defeat, he said "Harry ReidHarry ReidThe Memo: Trump pulls off a stone-cold stunner The Memo: Ending DACA a risky move for Trump Manchin pressed from both sides in reelection fight MORE." But he said, if Nevada Gov. Brian Sandoval is the GOP candidate, the Club would stay on the sidelines. The likely front-runner, if he runs, has come under fire from conservatives for tax hikes he's pushed in the state. 

"Everything I'm hearing is, if he decided to run, it'd clear the field," McIntosh said. "Because of his record of raising taxes, he'd be someone the Club would not engage in supporting and use the resources for others."