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 McCain#JohnMcCainDay trends on Trump's 73rd birthday #JohnMcCainDay trends on Trump's 73rd birthday New poll finds little GOP support for spending cuts to specific federal programs 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 Schweikert58 GOP lawmakers vote against disaster aid bill House ethics panel renews probes into three GOP lawmakers House Ethics Committee extends probe of Arizona GOP lawmaker MORE (R-Ariz.) and Matt SalmonMatthew (Matt) James SalmonArizona voters like Kyl but few think he'll stick around Former Sen. Jon Kyl to replace McCain in Senate Arizona governor faces pressure over McCain replacement 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 RubioElection security bills face GOP buzzsaw Election security bills face GOP buzzsaw The Hill's Morning Report — Uproar after Trump's defense of foreign dirt on candidates MORE (Fla.), Rand PaulRandal (Rand) Howard PaulOvernight Defense: Pompeo blames Iran for oil tanker attacks | House panel approves 3B defense bill | Trump shares designs for red, white and blue Air Force One Senate rejects effort to block Trump's Qatar, Bahrain arms sales Senate rejects effort to block Trump's Qatar, Bahrain arms sales MORE (Ky.) and Ted CruzRafael (Ted) Edward CruzOcasio-Cortez and Cruz's dialogue shows common ground isn't just for moderates Ted Cruz, AOC have it right on banning former members of Congress from becoming lobbyists Ted Cruz, AOC have it right on banning former members of Congress from becoming lobbyists 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 DonnellyConservatives spark threat of bloody GOP primaries Anti-corruption group hits Congress for ignoring K Street, Capitol Hill 'revolving door' K Street giants scoop up coveted ex-lawmakers 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 Steven KirkEx-GOP Sen. Kirk registers to lobby The global reality behind 'local' problems Dems vow swift action on gun reform next year 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 CoatsHillicon Valley: Tim Cook visits White House | House hearing grapples with deepfake threat | Bill, Melinda Gates launch lobbying group | Tech turns to K-Street in antitrust fight | Lawsuit poses major threat to T-Mobile, Sprint merger Hillicon Valley: Tim Cook visits White House | House hearing grapples with deepfake threat | Bill, Melinda Gates launch lobbying group | Tech turns to K-Street in antitrust fight | Lawsuit poses major threat to T-Mobile, Sprint merger House Intel to take first major deep dive into threat of 'deepfakes' 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 Mason ReidTrump weighs in on UFOs in Stephanopoulos interview Trump weighs in on UFOs in Stephanopoulos interview Impeachment will reelect Trump 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."