Sen. Brian Schatz Brian Emanuel SchatzCDC causes new storm by pulling coronavirus guidance Overnight Health Care: CDC pulls revised guidance on coronavirus | Government watchdog finds supply shortages are harming US response | As virus pummels US, Europe sees its own spike Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (D-Hawaii) is set to oppose 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's nomination to the top job at the State Department.

"I voted YES on Pompeo for CIA on the theory that he would be the 'adult in the room.' I was wrong," Schatz wrote on Twitter on Wednesday. "I am voting NO on Pompeo for Secretary of State because our top diplomat should believe in diplomacy. He has an alarming tendency towards military provocation and brinkmanship."

I voted YES on Pompeo for CIA on the theory that he would be the “adult in the room.” I was wrong. I am voting NO on Pompeo for Secretary of State because our top diplomat should believe in diplomacy. He has an alarming tendency towards military provocation and brinkmanship. — Brian Schatz (@brianschatz) April 11, 2018

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Schatz's announcement makes him the first Democrat who voted last year to confirm Pompeo as the CIA chief to oppose his nomination for secretary of State.

Pompeo was tapped for the top diplomatic job last month after 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 abruptly and unceremoniously fired now-former Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE.

He is set to appear before the Senate Foreign Relations Committee on Thursday for a hearing on his nomination.

While the other 13 Democrats who voted in 2017 to confirm Pompeo have not yet indicated whether they will sign off on his nomination to lead the State Department, some have voiced concerns about the CIA director's hawkish approach to foreign policy.

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.), who sits on the Foreign Relations Committee, said last month that he has "grave concerns" about Pompeo's nomination to the top State post, because of his views on diplomacy. Likewise, Sen. Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (D-N.H.), another member of the Foreign Relations Committee, has expressed concerns about the State Department nomination.

Both she and Kaine met with Pompeo on Tuesday to discuss the nomination, and have left the door open to voting for him.