President Trump’s nomination of Gina Haspel to lead the C.I.A. has revived debate over the agency’s post-Sept. 11 interrogation program and still-murky questions about her involvement. Now, on the eve of her Senate confirmation hearing, a striking voice is trying to join that fray: Khalid Shaikh Mohammed. Mr. Mohammed, the principal architect of the Sept. 11 attacks, was captured in March 2003 and tortured by the C.I.A. This week, he asked a military judge at Guantánamo Bay for permission to share six paragraphs of information about Ms. Haspel with the Senate Intelligence Committee. Ms. Haspel ran a black-site prison in...