Sen. Tim Kaine Timothy (Tim) Michael KaineButtigieg stands in as Pence for Harris's debate practice 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 (D-Va.) confirmed on Sunday he will not vote to confirm 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 as secretary of State, increasing the likelihood that 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 nominee could fail to get a positive vote out of committee.

“I have decided to vote against him to be secretary of State," Kaine told CBS News's Margaret Brennan on "Face the Nation."

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“We need a secretary of State who’s going to stand up for strong diplomacy, and I don’t believe that is Director Pompeo's inclination,” he said.

Kaine voted to confirm Pompeo as CIA director due to his background working in intelligence, but cited his opposition to the Iran nuclear deal and his support of Trump's military action in Syria without congressional approval for voting against him as the nation's top diplomat.

"Now more than ever, we need a Secretary of State who will stand strong for vigorous U.S. diplomacy. I believe that Mike Pompeo would exacerbate President Trump's weaknesses rather than uphold our diplomatic legacy," Kaine said in a separate statement.

On the Senate Foreign Relations Committee, 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.) has also said he will oppose Pompeo. If all of the panel's Democrats vote against Pompeo, he would not get a positive vote out of committee. Kaine sits on the panel.

Pompeo would be the first secretary of State nominee to receive an unfavorable committee vote since 1925, according to CNN.

Most observers think Pompeo would still be confirmed in a Senate floor vote, where centrist Democrats are likely to back his nomination.