Georgia’s soon-to-be Sen. Kelly Loeffler Kelly LoefflerDemocrats ramp up pressure on Lieberman to drop out of Georgia Senate race The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements GOP, Democrats look to galvanize women with SCOTUS fight MORE (R) will spend $20 million of her personal fortune on her bid to hold on to her Senate seat next year, according to a person familiar with her plans.

Loeffler, the multimillionaire CEO of an Atlanta-based financial services firm, was appointed on Wednesday to replace retiring Sen. Johnny Isakson Johnny IsaksonDemocrats ramp up pressure on Lieberman to drop out of Georgia Senate race Obama endorses Warnock in crowded Georgia Senate race Lobbying world MORE (R) in 2020. Her appointment sets up a special election next year that is expected to draw both Republican and Democratic challengers.

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Because it will be a special election, there won’t be primaries to determine the Republican and Democratic nominees, and candidates of all parties will appear on the ballot in November. If no candidate manages to reach the 50 percent threshold, a runoff election between the top two finishers will be held in January 2021.

Georgia Gov. Brian Kemp Brian KempPolitical reporter: Suburbs vital to winning Georgia in November Obama endorses Warnock in crowded Georgia Senate race Georgia GOP Senate candidates cite abortion in pushing Ginsburg replacement MORE’s (R) decision to tap Loeffler for the Senate seat has prompted frustration from some Republicans and allies of President Trump Donald John TrumpBiden says voters should choose who nominates Supreme Court justice Trump, Biden will not shake hands at first debate due to COVID-19 Pelosi: Trump Supreme Court pick 'threatens' Affordable Care Act MORE, who had pressed Kemp to appoint Rep. Doug Collins Douglas (Doug) Allen CollinsDemocrats ramp up pressure on Lieberman to drop out of Georgia Senate race The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements GOP, Democrats look to galvanize women with SCOTUS fight MORE (R-Ga.), the ranking member on the House Judiciary Committee, to take over for Isakson when he retires at the end of the year.

Even before Loeffler’s appointment on Wednesday, Collins had suggested that he may run for the Senate seat in 2020 if he was not appointed to replace Isakson.

Nevertheless, Senate Republicans have rallied behind Loeffler. The National Republican Senatorial Committee is expected to back her next year, and she has won praise from Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellHawley warns Schumer to steer clear of Catholic-based criticisms of Barrett Senate GOP set to vote on Trump's Supreme Court pick before election Harris slams Trump's Supreme Court pick as an attempt to 'destroy the Affordable Care Act' MORE (R-Ky.).

After Kemp announced Loeffler’s appointment on Wednesday, McConnell called on Senate Republicans to come out in support of the Atlanta businesswoman.

"Senator-designate Loeffler will have my full support for reelection in 2020 as a Republican incumbent and I encourage all my colleagues to join me,” McConnell said in a statement.

Still, next year’s race for Isakson’s seat is expected to be an expensive one, as Democrats and Republicans alike are expected to pour money into the race.