Berlusconi is charged with paying an under-age Moroccan teen for sex and then trying to cover it up with phone calls to Milan police officials when she was picked up for alleged theft. Berlusconi and the woman deny having had sex with each other.
Prosecutors are seeking a six-year jail term and a lifetime ban from politics. Whatever the verdict, the sentence can't be effective until two appeals are heard, a process that can take months.
His decision to head the center-right coalition rather than move aside for younger leaders as he said he would boosted his forces to a second-place finish behind the center-left.
The charges against the billionaire media mogul stem from Berlusconi's infamous "bunga bunga" parties at his Milan area mansion, where he wined and dined beautiful young women while he was premier.
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Neither Berlusconi nor the woman at the center of the case, Karima el-Mahroug, better known by her nickname Ruby, have testified in this trial. El-Mahroug was called by the defense but failed to show on a couple of occasions, delaying the trial. Berlusconi's team eventually dropped her from the witness list.
Boccassini wasn't in court today, but two other prosecutors were there as the judges began deliberating at 9.45 a m.
El-Mahroug, now 20, said she attended about a half-dozen parties at Berlusconi's villa, and that after each, Berlusconi handed her an envelope with up to USD 3,900 in denominations of 500. She said she later received 30,000 euros cash from the then-premier paid through an intermediary money that she told Berlusconi she wanted to use to open a beauty salon despite having no formal training.