MILAN  A long-delayed trial of C.I.A. operatives and former top Italian intelligence officials moved forward here on Wednesday, as a judge ruled that Prime Minister Silvio Berlusconi could be called to testify about the abduction of a radical Muslim cleric here in 2003.

Testimony also began Wednesday. The cleric’s wife, Ghali Nabila, said her husband, Hassan Mustafa Osama Nasr, known as Abu Omar, was taken from Italy and transferred to a prison in Egypt, where, she said, he was repeatedly tortured. While acknowledging a program of “extraordinary rendition,” or abducting terrorism suspects outside the United States, the Bush administration claims that no one is sent to nations that torture.

“I found him wasted, skinny  so skinny  his hair had turned white, he had a hearing aid,” Ms. Nabila said, recounting her husband’s condition between prison stays in 2004.

Wearing a veil that revealed only her eyes, Ms. Nabila at first said she “didn’t want to talk about” any abuse against her husband in prison. But advised by prosecutors that she had no choice, she told the court in tears: “He was tied up like he was being crucified. He was beat up, especially around his ears. He was subjected to electroshocks to many body parts.”