There is also little evidence that waterboarding and other forms of torture actually produced the intelligence the CIA sought. A 2014 report from the Senate Intelligence Committee found that the CIA repeatedly misled leaders in Congress and the White House about the effectiveness of its torture program and that the techniques were used far more widely than the agency acknowledged. Sen. Diane Feinstein, a California Democrat who was chairwoman of the committee at the time, expressed initial concern about Ms. Haspel's nomination, and she told the Washington Post that the more material she has reviewed, the more troubled she has become. Sen. John McCain, the Arizona Republican who was himself subject to torture as a prisoner of war in Vietnam, has also pressed Ms. Haspel on her record. His vote — already questionable because his health issues might keep him away — is critical, given Republicans 51-49 edge in the Senate.