George W. Bush to headline Rubio fundraiser
© Greg Nash

Former President George W. Bush will lend a hand to Sen. Marco RubioMarco Antonio RubioO'Rourke's rise raises hopes for Texas Dems down ballot Meghan McCain calls Russian attacks against her father the 'highest compliment' to her family The Memo: Saudi storm darkens for Trump MORE one month before the Florida Republican’s fierce reelection battle.

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Bush is planning to headline a fundraiser for Rubio, who faces Democratic Rep. Patrick Murphy in the general election, on Oct. 14 in Palm Beach, Fla., according to Palm Beach Post.

The former president, who doesn’t support GOP presidential nominee Donald TrumpDonald John TrumpDemocrats slide in battle for Senate Trump believes Kushner relationship with Saudi crown prince a liability: report Christine Blasey Ford to be honored by Palo Alto City Council MORE, has shied away from getting involved in the presidential race, but has campaigned and fundraised for Republicans running in tough Senate races.

Bush has hit the campaign trail for Sen. Rob PortmanRobert (Rob) Jones PortmanOn The Money: Mnuchin to attend anti-terror meeting in Saudi Arabia | Treasury releases guidance on 'opportunity zone' program | Maxine Waters gets company in new GOP line of attack Election Countdown: O'Rourke brings in massive M haul | Deal on judges lets senators return to the trail | Hurricane puts Florida candidates in the spotlight | Adelson spending big to save GOP in midterms How Kavanaugh got the votes  MORE (R-Ohio), his former U.S. trade representative, as well as Rep. Todd YoungTodd Christopher YoungMnuchin pulls out of Saudi conference On The Money: Treasury official charged with leaking info on ex-Trump advisers | Trump to seek 5 percent budget cut from Cabinet members | Mnuchin to decide by Thursday on attending Saudi conference Mnuchin to decide by Thursday whether to attend Saudi conference MORE (R-Ind.) on Monday. Young is running against former Sen. Evan Bayh (D-Ind.) for the seat being vacated by GOP Sen. Dan CoatsDaniel (Dan) Ray CoatsHillicon Valley: Intel chief wants tech, government to work more closely | Facebook doesn't believe foreign state behind hack | New net neutrality lawsuit | Reddit creates 'war room' to fight misinformation Hillicon Valley: Russia-linked hackers hit Eastern European companies | Twitter shares data on influence campaigns | Dems blast Trump over China interference claims | Saudi crisis tests Silicon Valley | Apple to let customers download their data Overnight Defense — Presented by The Embassy of the United Arab Emirates — Senators seek US intel on journalist's disappearance | Army discharged over 500 immigrant recruits in one year | Watchdog knocks admiral over handling of sexual harassment case MORE.

The race between Murphy and Rubio has been heating up in the final two months of the campaign. It’s a seat that could be pivotal in determining which party controls the upper chamber next year.

Rubio goes into the race with higher name recognition after his unsuccessful run for his party’s nomination for president. A RealClearPolitics polling average has him ahead by 4.4 points.

Still, political observers in the state expect the race to tighten as it gets closer to November and believe the Senate race will hinge on voter turnout and what happens at the top of the ticket.