Republican megadonor Sheldon Adelson and his wife are planning to spend $45 million to help boost 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 and preserve GOP majorities in Congress, according to CNN.

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Adelson contributed $20 million to the Senate Leadership Fund, a GOP super PAC that has ties to Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellGraham: GOP will confirm Trump's Supreme Court nominee before the election Trump puts Supreme Court fight at center of Ohio rally The Memo: Dems face balancing act on SCOTUS fight MORE (R-Ky.), and will disclose the donation Tuesday. He’s planning to give a similar amount to Congressional Leadership Fund, a super PAC focused on the lower chamber.

The Las Vegas casino magnate is also planning to donate at least $5 million to the Ricketts family’s political operation in an effort to help Trump. The owners of the Chicago Cubs are supposed to also donate to support the GOP nominee.

This is the first time this cycle that Adelson will contribute to help Trump, though he has endorsed the real estate mogul and has previously signaled that he’d give him a financial boost.

Adelson said back in May that he was willing to donate more than $100 million to Trump’s campaign. He spent at least $98 million on the 2012 elections, according to ProPublica.

The financial help comes as Trump starts to catch up to Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE’s significant fundraising operation and as he closes the gap with Clinton in polls nationally and a handful of battleground states.

It also gives a jolt of momentum to Republicans as they seek to defend their slim Senate majority and protect their 30-seat advantage in the House.