“Sen. Ayotte brings invaluable insight to our conference on issues that affect American families. Firmly committed to getting our fiscal house in order, she will perform a critical role as a member of the Senate Republican Leadership team,” McConnell said in a statement.

Ayotte will serve alongside Sen. Bob CorkerRobert (Bob) Phillips CorkerOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Corker pressed as reelection challenges mount MORE (R-Tenn.) in the informal leadership post, and replaces Sen. Kay Bailey Hutchison (R-Texas), who retired this year.

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Ayotte and Corker's positions differ from the Senate's official Republican leadership, which includes Whip John CornynJohn CornynNew GOP ObamaCare repeal bill gains momentum Week ahead: Senators near deal to stabilize ObamaCare markets GOP eying 'blue slip' break to help Trump fill the courts MORE (Texas), Conference Chairman John ThuneJohn Randolph ThuneAviation panel recommends Trump roll back safety rules Overnight Regulation: House moves to block methane rule | Senators wrestle with allowing driverless trucks | EPA delays toxic waste rule Overnight Tech: Senate looks at self-driving trucks | Facebook to keep ads off fake news | House panel calls Equifax CEO to testify MORE (S.D.) and Policy Committee Chairman John BarrassoJohn Anthony BarrassoDems force 'Medicare for All' on Americans but exempt themselves GOP sees fresh opening with Dems’ single payer embrace Overnight Health Care: CBO predicts 15 percent ObamaCare premium hike | Trump calls Sanders single-payer plan ‘curse on the US’ | Republican seeks score of Sanders’s bill MORE (Wy.). Sen. Roy BluntRoy Dean BluntTop Senate Dem: We're going forward with understanding we can work with White House on DACA Sunday shows preview: Trump officials gear up for UN assembly Air Force One is Trump’s new boardroom MORE (Mo.) also serves as the Conference vice chairman, and Sen. Jerry MoranGerald (Jerry) MoranIT modernization measure included in Senate-approved defense policy bill Campaign video touts apprenticeships making Trump commemorative coins Senate approves Trump's debt deal with Democrats MORE (Kan.) chairs the National Republican Senatorial Committee.

Ayotte has taken an increasingly prominent role in the Senate, partially propelled by her surrogate work for Mitt Romney's campaign last fall. She was reportedly considered as a candidate for Romney's running mate before the former Massachusetts governor selected Rep. Paul RyanPaul RyanRyan: Graham-Cassidy 'best, last chance' to repeal ObamaCare Ryan: Americans want to see Trump talking with Dem leaders Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea MORE (R-Wis.).

The New Hampshire lawmaker also made headlines late last year when she joined Sens. John McCainJohn Sidney McCainSenate's defense authorization would set cyber doctrine Senate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions MORE (R-Ariz.) and Lindsey GrahamLindsey Olin GrahamTop Louisiana health official rips Cassidy over ObamaCare repeal bill Senate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions MORE (R-S.C.) in questioning the qualifications of U.S. Ambassador to the United Nations Susan Rice. Rice was seen as President Obama's top choice to replace Hillary ClintonHillary Diane Rodham ClintonBiden slams Trump over golf gif hitting Clinton Overnight Cybersecurity: Equifax hit by earlier hack | What to know about Kaspersky controversy | Officials review EU-US privacy pact Overnight Tech: Equifax hit by earlier undisclosed hack | Facebook takes heat over Russian ads | Alt-right Twitter rival may lose domain MORE as secretary of State in his second term. 

Rice met directly with Ayotte but was unable to win her favor, amid GOP criticism of the ambassador's handling of the September attack on the U.S. Consulate in Benghazi, Libya. Obama later nominated Sen. John KerryJohn Forbes KerryBringing the American election experience to Democratic Republic of the Congo Some Dems sizzle, others see their stock fall on road to 2020 The Hill's 12:30 Report MORE (D-Mass.) to the position.