Senate Republicans are preparing for a shuffling of committee chairmen and some changes in the upper ranks of Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE’s (R-Ky.) leadership team.

Sen. John Thune John Randolph ThuneOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Remote work poses state tax challenges Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.D.) is expected to be elected as Republican whip, the No. 2 position in the conference, when GOP lawmakers meet to vote on their new team at 9:30 a.m. on Wednesday in the Old Senate Chamber.

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Thune will replace Sen. John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court MORE (R-Texas), who is facing a term limit as whip. Cornyn will retain his position through the lame-duck session and then take a role as a counselor to McConnell’s leadership team next year, allowing him to remain a participant in leadership strategy sessions.

It’s a major promotion for Thune, who GOP senators say is one of the most effective communicators in the conference, and it could put him in a position to run for Senate Republican leader in the future.

McConnell, however, shows no signs of stepping down anytime soon and told reporters last week that he will run for reelection in 2020.

Sen. John Barrasso John Anthony BarrassoThe conservative case for phasing out hydrofluorocarbons GOP senator attacks Biden: 'I'm not sure what he recalls' Oil and gas is a partner — not an adversary — in meeting our economic and environmental goals MORE (R-Wyo.) will step up to become the new chairman of the Senate Republican Conference, filling Thune’s old job, and Sen. Roy Blunt Roy Dean BluntSocial media platforms put muscle into National Voter Registration Day Senate GOP faces pivotal moment on pick for Supreme Court This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda MORE (R-Mo.) will take over Barrasso’s current position as chairman of the Republican Policy Committee, the No. 4 position.

Sens. Joni Ernst Joni Kay ErnstThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Romney backs pre-election Supreme Court vote, paving way for McConnell, Trump MORE (R-Iowa) and Deb Fischer Debra (Deb) Strobel FischerHillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections Google, Apple, eBay to meet virtually with lawmakers for tech group's annual fly-in Congress botched the CFPB's leadership — here's how to fix it MORE (R-Neb.) are competing to succeed Blunt as vice chair of the Senate GOP conference, the only contested leadership position.

McConnell is eager to add a woman to his elected leadership team, according to Republican sources, after coming under criticism earlier this Congress for not including a woman on the special health-care working group he assembled in 2017.

Ernst is better-known nationally and viewed as an effective communicator on television while Fischer, who serves as a counselor to McConnell’s leadership team, has worked behind the scenes to build strong relationships with GOP leaders.

Sen. 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.) is making an uncontested bid to serve as National Republican Senatorial Committee chairman.

When it comes to shifts among committee chairmen, all eyes are on Sen. Chuck Grassley Charles (Chuck) Ernest GrassleyThe Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy Read: Senate GOP's controversial Biden report MORE (R-Iowa), who is expected to leave his position as chairman of the Senate Judiciary Committee to take over as chairman of the Finance Committee, according to a Republican source with knowledge of internal discussions.

If Grassley slides over to chair the Finance Committee, then Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.), an outspoken ally of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE who blasted Democrats over their handling of Supreme Court Justice Brett Kavanaugh Brett Michael KavanaughHarris faces pivotal moment with Supreme Court battle Poll: 59 percent think president elected in November should name next Supreme Court justice Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight MORE’s confirmation, would take over the Judiciary gavel.

Grassley’s spokesman Michael Zona told The Hill last week that his boss would announce his decision publicly after he spoke to colleagues.

A spokesman for Graham declined to comment.

Chairmen won’t be elected by their committees until after the Senate’s new committee ratios are negotiated, which will wait until the winners of the Florida, Arizona and Mississippi Senate races are known.

If Grassley stays at Judiciary, however, it would open the way for Sen. Mike Crapo Michael (Mike) Dean CrapoBottom line Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump Top GOP senator urges agencies to protect renters, banks amid coronavirus aid negotiations MORE (R-Idaho) to take over as chairman of the Finance Committee and Sen. Pat Toomey Patrick (Pat) Joseph ToomeyAppeals court rules NSA's bulk phone data collection illegal Dunford withdraws from consideration to chair coronavirus oversight panel GOP senators push for quick, partial reopening of economy MORE (R-Pa.) to take over as chairman of the Banking Committee.

Thune is set to step down as chairman of the Commerce Committee, paving the way for Sen. Roger Wicker Roger Frederick WickerBottom line Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (R-Miss.) to take over that panel.

Sen. Jim Risch James (Jim) Elroy RischWhy the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump Senators blast Turkey's move to convert Hagia Sophia back into a mosque MORE (R-Idaho) is poised to take over as chairman of the Senate Foreign Relations Committee when Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) retires at the end of the year.

Senate Democrats will also meet Wednesday to vote on their new leadership team, and a senior Democratic aide said no changes are expected.

Senate Democratic Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (N.Y.), Senate Democratic Whip Dick Durbin Richard (Dick) Joseph DurbinFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Grand jury charges no officers in Breonna Taylor death Democrats shoot down talk of expanding Supreme Court MORE (Ill.), Assistant Democratic Leader Patty Murray Patricia (Patty) Lynn MurraySenate Democrats introduce legislation to probe politicization of pandemic response Trump health officials grilled over reports of politics in COVID-19 response CDC director pushes back on Caputo claim of 'resistance unit' at agency MORE (Wash.) and Policy and Communications Committee Chairwoman Debbie Stabenow Deborah (Debbie) Ann StabenowOVERNIGHT ENERGY: Trump rollbacks could add 1.8 billion tons of greenhouse gas emissions over 15 years: analysis | Intensifying natural disasters do little to move needle on climate efforts | Experts warn wildfire smoke could worsen COVID-19 GAO report finds brokers offered false info on coverage for pre-existing conditions Democrats back away from quick reversal of Trump tax cuts MORE (Mich.) will keep their jobs.

“As far as I know, it’s exactly the same,” said a Senate Democratic aide. “The leadership team all the way down to the lower levels will stay exactly the same.”

Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) and Sen. Mark Warner Mark Robert WarnerDemocrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits Intelligence chief says Congress will get some in-person election security briefings MORE (D-Va.) are expected to stay on as vice chairmen of the Democratic Conference, Sen. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.) is expected to serve another term as chairwoman of the Steering Committee and Sen. Bernie Sanders Bernie SandersOutrage erupts over Breonna Taylor grand jury ruling Dimon: Wealth tax 'almost impossible to do' Grand jury charges no officers in Breonna Taylor death MORE (I-Vt.) is expected to serve another term as chairman of outreach.

Sen. Joe Manchin Joseph (Joe) ManchinManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House MORE (D-W.Va.) is expected to serve another Congress as vice chairman of policy and communications and Sen. Tammy Baldwin Tammy Suzanne BaldwinSenators introduce bipartisan bill to mandate digital apps disclose country of origin Keep teachers in the classroom Cher raised million for Biden campaign at LGBTQ-themed fundraiser MORE (D-Wis.) will serve again as conference secretary, said the Democratic aide.

One question mark is who will succeed Sen. Chris Van Hollen Christopher (Chris) Van HollenCongress must finish work on popular conservation bill before time runs out Democrats fear Russia interference could spoil bid to retake Senate Mid-Atlantic states sue EPA over Chesapeake Bay pollution MORE (Md.) as chairman of the Democratic Senatorial Campaign Committee.

He served two cycles as chairman of the Democratic Congressional Campaign Committee when he was in the House, so he could be in the mix for another term.

A spokeswoman for Van Hollen declined to comment.