Former President George W. Bush will lend a hand to Sen. Marco Rubio Marco Antonio RubioMurky TikTok deal raises questions about China's role Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Florida senators pushing to keep Daylight Savings Time during pandemic 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 Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid 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 Portman Robert (Rob) Jones PortmanMcConnell locks down key GOP votes in Supreme Court fight Romney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery MORE (R-Ohio), his former U.S. trade representative, as well as Rep. Todd Young Todd Christopher YoungSenate GOP eyes early exit Why the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Ind.) on Monday. Young is running against former Sen. Evan Bayh (D-Ind.) for the seat being vacated by GOP Sen. Dan Coats Daniel (Dan) Ray CoatsFBI chief says Russia is trying to interfere in election to undermine Biden The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Former Intel chief had 'deep suspicions' that Putin 'had something on Trump': book 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.