The presidential palace yesterday said President Sergio Mattarella had shaved one year off India-born Sabrina de Sousa's four-year sentence for her role in the abduction of the cleric, Osama Moustafa Hassan Nas.
Also known as Abu Omar, he was kidnapped from a Milan street in February 2003.
The kidnapping was carried out under the United States' "extraordinary rendition" anti-terrorism program, which was launched after the September 11, 2001 attacks. The program saw suspects kidnapped and transferred to centers abroad, where they were interrogated and often tortured. De Sousa denied involvement.
The palace noted that because her sentence was reduced to three years, she can serve out the remainder of her term outside prison, although it was unclear if she would be able to do that in Portugal.
More From This Section
In evaluating de Sousa's request for clemency, Mattarella took into account "that the United States has interrupted the practice of extraordinary renditions," a reference to the Obama administration's decision to halt the programme.
Mattarella and his predecessor cited the same circumstances in previously granting clemency to other defendants in the case. She was one of 26 Americans who were tried and convicted in absentia for the cleric's kidnapping. Her lawyer in Italy couldn't immediately be reached for comment.
Italy was the first country to prosecute US intelligence agents for roles in the rendition programme.
De Sousa was detained on an international warrant at the Lisbon airport in October 2015 while en route to India to visit her mother. She has said she had been living in Portugal and intended to settle there.
She repeatedly fought her extradition and lost several appeals after her arrest. She had argued she was never officially informed of the Italian court conviction and could not use confidential US government information to defend herself.