In a letter to the top Democrat on the Senate Intelligence Committee, Senator Mark Warner of Virginia, Ms. Haspel said one of the “hard lessons since 9/11” was the costs of the agency’s use of torture, which she called “enhanced interrogation.” The committee is set to vote on her nomination on Wednesday.

“While I won’t condemn those that made these hard calls, and I have noted the valuable intelligence collected, the program ultimately did damage to our officers and our standing in the world,” she wrote. “With the benefit of hindsight and my experience as a senior agency leader, the enhanced interrogation program is not one the C.I.A. should have undertaken. The United States must be an example to the rest of the world, and I support that.”