But by the time he released the statement, two key swing votes on the committee, Manchin and GOP moderate Senator Susan Collins of ME, had already announced they would vote for Haspel.
"The United States must be an example to the rest of the world, and I support that", she said in her letter.
The Senate Intelligence Committee is to vote Wednesday at a closed-door session to approve Haspel's nomination and send it to the full Senate.
Senators on the intelligence committee grilled Haspel earlier this month regarding her role in the post-9/11 interrogations and the 2005 destruction of video evidence of CIA agents waterboarding terrorist suspects.
Second US Democrat to support Haspel as new Central Intelligence Agency chief
Rand Paul (R-Ky.) and John McCain (R-Ariz.) are the only Republicans who have publicly said they will not support Haspel, while Sen.
Warner released the letter and on Tuesday afternoon, announced that in light of her assurances, he will support her nomination. Her written comments went farther than ones she made at her confirmation hearing. But critics have said she should have been more forceful in denouncing torture and Mr. Paul has said she had not come fully clean on her role in the agency's harsh interrogation and secret prison programs in the wake of the 9/11 attacks.
Sen. Bernie Sanders (I-VT) is one of several lawmakers attempting to explain their hypocritical obstruction of Gina Haspel's nomination for Central Intelligence Agency director.
With the Republican Party holding only a 51-49 margin in the Senate, cut to 50-49 in practice because of McCain's long absence due to terminal brain cancer, the shift of even one senator had the potential to torpedo the nomination. John McCain of Arizona is absent. It was President Obama who decided that John Brennan, Jose Rodriguez, Gina Haspel and others involved in the torture program should not face prosecution. "I think what we did helped ultimately produce the intelligence we needed to be able to get (Osama) bin Laden", Cheney said.
Manchin, Donnelly and Heitkamp all are running for reelection in states that Trump won by wide margins in 2016. Trump blasts White House leakers as "traitors" Haspel confirmation vote set for Wednesday The Hill's Morning Report - Sponsored by CVS Health - Trump makes history with foreign policy decisions MORE (Ind.) have said they will vote for Haspel.