Aamer told ITV News "we need to hear the truth" from Blair and others but "you are not going to get the truth from these people if they are scared."
In the interview broadcast Monday, he said he wanted an inquiry to find out the truth but said "nobody should be prosecuted because of what happened in the past."
Aamer says he was tortured by U.S. forces in Afghanistan and Guantanamo — and that British intelligence agents knew of the abuse.
The British government says it opposes torture in all circumstances.
In a separate interview, Aamer told the BBC that he did not plan to sue the British government over his detention.
Aamer — a Saudi citizen who married a British woman and moved to London in the mid-1990s — says he moved to Taliban-controlled Afghanistan because he wanted to live in a Muslim country. In the chaos that followed the 2001 U.S.-led invasion, he was captured by the anti-Taliban Northern Alliance and turned over to U.S. forces. He was sent to Guantanamo in February 2002.
The U.S. Defense Department has said Aamer shared an apartment in the late 1990s with Zacarias Moussaoui, who was convicted of taking part in the Sept. 11 conspiracy, and that he received a stipend from the late al-Qaida leader Osama bin Laden.
He was never charged, and was freed after a task force appointed by U.S. President Barack Obama conducted a "comprehensive review" of his case.
Aamer said he did not know Moussaoui and had falsely confessed under torture to knowing bin Laden.
"I told them what they want so I can be left alone," he told ITV.
Aamer likened Guantanamo to Azkaban, the prison from the "Harry Potter" stories, "where there`s no happiness."
"They just suck all your feeling out of you," he told the BBC. "Truly, that`s how I felt all the time."
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