The Senate confirmation hearing for Gina Haspel, President Trump's choice to lead the CIA, hasn't yet been scheduled. But several senators have already expressed reservations due to Haspel's role in the CIA's waterboarding of al-Qaida suspects after the Sept. 11, 2001, terrorist attacks.

Sen. John McCain, the Arizona Republican who was a prisoner of war in Vietnam, posted this tweet Tuesday:

Waterboarding and other harsh interrogation methods appear set for another round of litigation in the court of public opinion as the Senate prepares to vote on Haspel's nomination.

In many ways, U.S. laws and policies are much clearer today than in the past and have effectively settled some legal questions.

President Obama banned torture with an executive order in 2009. The Republican-led Congress followed up with its own torture ban in a 2015 law. The Army Field Manual spells out which types of interrogation are permitted, and waterboarding is not among them.

The likely debate

Still, that doesn't mean the discussion is over. Not by a long shot.

"The debate that will occur around the Haspel nomination may help clear the air by putting these issues before the public," said John Prados, a senior fellow at the National Security Archive, a nonprofit in Washington that advocates for government openness.

However, if Haspel and the CIA are not forthcoming, it could create a new backlash, he warned.

"I believe the agency is mistaken if it thinks it can escape from what happened here," added Prados, a frequent critic of the agency and the author of The Ghosts of Langley: Into The CIA's Heart Of Darkness.

John Rizzo, who was the CIA's acting general counsel in the period after the Sept. 11 attacks, also believes a renewed discussion could be helpful.

"Now, with the benefit of time, I think the country would be well served by a reasoned, non-emotional discussion about whether any kind of interrogation technique, beyond a standard Q&A, is ever justifiable — or effective, for that matter," Rizzo told NPR's Morning Edition.

However, Rizzo, who said he's known Haspel since the 1990s, remains a supporter of the tough interrogation methods.

"I have some regrets, but I still continue to believe the program was effective," he said. "I have a strong feeling that the information in question — and there was a lot of it — would not have come nearly as quickly without resorting to aggressive measures."

He does not think those measure amounted to torture.

"I do not believe that the word 'torture' was and is legally accurate," he said. "There were very harsh, very brutal methods. But not torture."

Trump's campaign comments

Legally speaking, an attempt to resume waterboarding or other similarly harsh techniques would require new legislation reversing the measures put in place in recent years, legal scholars say. In practical political terms, any technique that amounts to torture is certain to provoke a firestorm of criticism.

Trump raised the issue during the 2016 presidential campaign, saying, "I would bring back waterboarding, and I would bring back a hell of a lot worse than waterboarding."

During the first days of the Trump administration in January 2017, McCain said: "The president can sign whatever executive orders he likes. But the law is the law. We are not bringing back torture in the United States of America."

In addition, Defense Secretary Jim Mattis and other current and former officials in the military and intelligence communities have spoken out against waterboarding.

An undercover career

Haspel was an undercover CIA officer for three decades and therefore has no public record. Some Democratic senators objected when she was named the CIA's deputy director a year ago, but that position did not require Senate confirmation.

In addition to overseeing a black site prison in 2002, she was deeply involved in the 2005 decision to destroy videotapes of the waterboarding sessions. That action came after Congress had learned of the videos and called on them to be preserved.

The Justice Department spent years investigating alleged abuses in the interrogation program, but no one was ever charged with a crime. Haspel's supporters say that she and others involved were asked to do a tough job and were given assurances that their actions were legal.

"People in the prosecution of their duties inside government take on a great burden," said Danielle Pletka of the conservative American Enterprise Institute. "They do not deserve to be indicted on Twitter or by Wikileaks or in the press before they get a hearing."

When Haspel was at the black site prison in Thailand, two al-Qaida suspects, Abu Zabaydah and Abd al-Rahim al-Nashiri, were being interrogated there. Both were eventually sent to the U.S. prison in Guantanamo Bay, Cuba, where they still await trial.

One big question is whether evidence obtained during their interrogations will be admissible at a trial.

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