GUANTANAMO BAY, Cuba — A clash over the Senate Intelligence Committee’s 2014 report on the CIA’s enhanced interrogation program, which the Democratic majority called torture, took center stage throughout a 9/11 court hearing in Guantanamo Bay, Cuba.

Dr. James Mitchell, 68, a psychologist who helped design interrogation techniques for the CIA in the wake of the 9/11 attacks, spent much of his testimony this week defending his actions as legal and arguing that he’d helped stop future attacks.