Haspel has not disclosed any details of what she did in connection with the interrogation program or say whether she thought it had been immoral.

But during her confirmation hearing last week, she said she doesn't believe torture works as an interrogation technique and that her "strong moral compass" would prevent her from carrying out any presidential order she found objectionable.

"With the benefit of hindsight and my experience as a senior agency leader, the enhanced interrogation program is not one the CIA should have undertaken," according to Haspel's written answers to some 60 additional questions from lawmakers.

Bolstering the comments she made during her hearing, Haspel wrote, "I do not support use of enhanced interrogation techniques for any purpose."

Attention now turns to the vote by the full Senate, which has not yet been scheduled. Haspel has already won the backing of several Democrats. They include Mark Warner of Virginia, Joe Manchin of West Virginia, Joe Donnelley of Indiana, Bill Nelson of Florida and Heidi Heitkamp of North Dakota.

The only Senate Republicans who are not expected to vote for her are Kentucky's Rand Paul and Arizona's John McCain, who is battling cancer and is not expected to be present for the ballot.

Haspel's opponents, however, continue to weigh into the debate.

"Ms Haspel is cynically trying to offer mere words in an attempt to win votes to support her confirmation," said Charles Krulak, former commandant of the Marine Corps.

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"The definition of moral courage is doing the right thing at the right time for the right reasons when no one's looking. Gina Haspel failed that test," said Krulak, who organised a letter signed by more than 100 retired generals and admirals expressing concern over her nomination.

Daphne Eviatar with Amnesty International on Tuesday called Haspel's nomination an "affront to human rights."

"This country has not held any officials accountable for the use of torture, so it's even more outrageous that the government is considering someone to the chief intelligence position in spite of her alleged participation in that clearly illegal and immoral activity," she said.

AP