Sen. Joe Donnelly Joseph (Joe) Simon DonnellyTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day MORE (D-Ind.) on Monday became the third Democrat to say he will vote for CIA Director Mike Pompeo Michael (Mike) Richard PompeoOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Overnight Defense: House Democrats unveil stopgap spending measure to GOP opposition | Bill includes .6B for new subs | Trump issues Iran sanctions after world shrugs at US action at UN Navalny calls on Russia to return clothes he was wearing when he fell ill MORE to be President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's next secretary of State.

"We need a Secretary of State who will give the president an honest assessment on critical issues, including Russia, Syria, and the defeat of [the Islamic State in Iraq and Syria] ISIS. I believe Director Pompeo is capable of advancing U.S. interests and leading the State Department," Donnelly said in a statement.

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Pompeo already has the votes needed to be confirmed by the full Senate.

In addition to Donnelly, Democratic Sens. Joe Manchin Joseph (Joe) ManchinThe 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 Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (W.Va.) and Heidi Heitkamp Mary (Heidi) Kathryn HeitkampCentrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents Susan Collins set to play pivotal role in impeachment drama MORE (N.D.) — each of whom are up for reelection in states Trump won in 2016 — have said they will vote for Pompeo.

With Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.) opposed to the nomination, Pompeo only needed to pick up one Democratic vote in order to secure the 50 votes needed to be confirmed.

But the boost of momentum comes as the Senate Foreign Relations Committee is poised to snub Pompeo on Monday evening by refusing to give him a favorable vote.

Paul, a member of the panel, is expected to join with the 10 Democrats on the committee to oppose Pompeo's nomination.

But Republicans are expected to bring his nomination to the Senate floor regardless of the committee vote.

Foreign Relations Committee Chairman Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) could try to send Pompeo to the Senate floor with either an unfavorable recommendation or no recommendation.

As an alternative, Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) could try to discharge the nomination from committee, a move which could ultimately need 60 votes.

Several other Democratic senators remain on the fence ahead of a showdown over Pompeo.

Democratic Sen. Doug Jones (Ala.), who wasn't in the chamber for Pompeo's CIA director vote, has yet to say if he will support Pompeo.

Meanwhile, of the 14 Democrats — plus Sen. Angus King Angus KingGovernment watchdog recommends creation of White House cyber director position Democrats step up hardball tactics as Supreme Court fight heats up Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (I-Maine), who caucuses with the Democrats — who supported Pompeo last year, five have yet to announce how they will vote: Maggie Hassan (N.H.), Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (Mo.), Minority Leader Charles Schumer (N.Y.), Mark Warner (Va.) and King.