The new military judge presiding over the September 11 attacks trial in Guantanamo Bay said Wednesday he would not force it toward an end -- but that he wanted to see "action" after nine years of hearings.

Air Force Colonel Matthew McCall told the military commissions court at the US navy base in Cuba, that he would not stop lawyers defending 9/11 "architect" Khalid Sheikh Mohammed and four others from making their case that the men were denied due process because they were tortured by the CIA.

Speaking just three days before the 20th anniversary of the Al-Qaeda attacks, he said he wanted to move through the long-running pretrial phase of a death penalty case that has already gone through seven judges.

"This case has been going on a really long time," he told the attorneys, defendants, and family members of the 9/11 victims at the courtroom.

"I feel no pressure to get this case to trial," he said, amid defense concerns of political interference.

Nevertheless, he said, "I would like to see action," to move things ahead.

The second day of hearings after an 18-month break due to the Covid-19 pandemic focused on a review of the judge's own potential biases.

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Accused September 11, 2001 attacks mastermind Khalid Sheikh Mohammed (R) along with co-defendants Ramzi bin al-Shibh (L) and Walid bin Attash (C) in a pretrial hearing Photo: William J. HENNESSY / William J. HENNESSY

Gary Sowards, one of Mohammed's attorneys, pressed McCall on his personal reaction to the September 11, 2001 attacks, his experience reviewing detainees in Iraq, and his view of the issues surrounding the high-security trial of the five.

"This is a political trial," said Sowards, saying the government has used its power to mask the CIA's torture of the five men at secret "black sites" before they arrived at Guantanamo in 2006.

"The effects of torture are always in the room," he said.

"Their big trump card is national security and state secrets," he said of the military prosecutors.

Mohammed and alleged co-conspirators Ammar al-Baluchi, Walid bin Attash, Ramzi bin al-Shibh and Mustafa al-Hawsawi, who were all in the courtroom for the second day, are accused of terrorism and mass murder of 2,976 people in the attacks.

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This photo screened by US Military officials on September 7, 2021 shows a sign for Camp Justice in Guantanamo Bay Naval Base, Cuba, the site of the trial of Khalid Sheikh Mohammed and four others charged in the September 11, 2001 attacks. Photo: AFP / Paul HANDLEY

Defense attorneys challenged McCall over his view of Islam after he said he read books by Middle East historian Bernard Lewis before he deployed to Iraq in the early 2000s.

Lewis, who wrote of the "Clash of Civilizations," became controversial for encouraging the administration of George W. Bush to invade Iraq in hopes of resetting the course of history and society in the Arab world.

McCall said he did not hold the same views.

"I don't think you can look at Islam as one big block," he said.

All religions have their moderates and extremists, he added.

"I try to read different sources of news," he insisted, adding is considers himself "fairly open-minded."

He said as a military attorney he had worked in Iraq in the 2000s reviewing cases of detainees before they were placed into the Iraqi justice system.

Most were guilty of nothing serious and deserved release, he said.

But he said he was not responsible for some who the Iraqis put to death, and others who remained in detention despite no evidence against them.

He called the death penalty "a valid option" in the 9/11 case.

He added that, given the number of death row inmates who have been shown to be innocent in the United States, a sentence of execution demands a "higher standard" of proof.

McCall closed Wednesday's hearing in the afternoon, scheduling Thursday for private conferences, and planned to complete the review of his own qualifications on Friday.

He plans to turn the court to substantive issues next week.

The defense has readied scores of motions to obtain classified evidence supporting their arguments that the prosecution's case is tainted by the lasting effects of torture.

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