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Mark Kelly to be sworn in as senator on Wednesday

Sen.-elect Mark KellyMark KellyWall Street spent .9B on campaigns, lobbying in 2020 election: study The Hill's Morning Report - Presented by Tax March - CDC in limbo on J&J vax verdict; Rep. Brady retiring Schumer lays groundwork for future filibuster reform MORE (D-Ariz.) will be sworn in on Wednesday, according to a senior Democratic aide.

Kelly defeated GOP Sen. Martha McSallyMartha Elizabeth McSallyArizona state senator announces bid for Kirkpatrick's seat Democratic Arizona Rep. Ann Kirkpatrick says she won't seek reelection Senate GOP faces retirement brain drain MORE (Ariz.) earlier this month and the results of the race are expected to be certified on Monday, clearing the way for him to join the Senate.

The swearing-in of Kelly, who is married to former Rep. Gabby Giffords (D-Ariz.), will narrow the Senate GOP majority from 53-47 to 52 Republican seats to the Democrats' 48.

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In addition to McSally, Democrats defeated GOP Sen. Cory GardnerCory GardnerBiden administration reverses Trump changes it says 'undermined' conservation program Gardner to lead new GOP super PAC ahead of midterms OVERNIGHT ENERGY: Court rules against fast-track of Trump EPA's 'secret science' rule | Bureau of Land Management exodus: Agency lost 87 percent of staff in Trump HQ relocation | GM commits to electric light duty fleet by 2035 MORE (Colo.), while Republicans unseated Democratic Sen. Doug Jones (Ala.). Which party will control the chamber in January remains in limbo and will be decided by the outcome of the two January runoff elections in Georgia.

But Kelly's ascension to the Senate does complicate a GOP effort to confirm Judy Shelton, President TrumpDonald TrumpBiden administration still seizing land near border despite plans to stop building wall: report Illinois House passes bill that would mandate Asian-American history lessons in schools Overnight Defense: Administration says 'low to moderate confidence' Russia behind Afghanistan troop bounties | 'Low to medium risk' of Russia invading Ukraine in next few weeks | Intelligence leaders face sharp questions during House worldwide threats he MORE's controversial Federal Reserve Board nominee.

An attempt to confirm Shelton before the Thanksgiving recess ran into a roadblock because of GOP opposition and coronavirus-related absences.

Because three Republican senators — Lamar AlexanderLamar AlexanderSenate GOP faces retirement brain drain The Hill's Morning Report - Presented by the National Shooting Sports Foundation - CDC news on gatherings a step toward normality Blunt's retirement deals blow to McConnell inner circle MORE (Tenn.), Susan CollinsSusan Margaret CollinsModerates' 0B infrastructure bill is a tough sell with Democrats OVERNIGHT ENERGY: Senate confirms Mallory to lead White House environment council | US emissions dropped 1.7 percent in 2019 | Interior further delays Trump rule that would make drillers pay less to feds Anti-Asian hate crimes bill overcomes first Senate hurdle MORE (Maine) and Mitt RomneyWillard (Mitt) Mitt RomneyModerates' 0B infrastructure bill is a tough sell with Democrats Sinema, Romney propose bill to tackle student loan debt Romney, Sinema teaming up on proposal to raise minimum wage MORE (Utah) — oppose Shelton, once Kelly is sworn in she will not have the votes to be confirmed unless McConnell can get one of the senators to change their votes or take advantage of a Democratic absence.