"There are attacks of unprecedented force against me but I will keep going," Berlusconi said in a phone link-up with a rally of his People of Freedom party (PDL) in the town of Fabriano in central Italy "These inquiries are a farce and will boomerang," Berlusconi said, adding: "I am determined to continue, strong in the knowledge that I am in right."

"For 17 years I've been hurled accusations that are as heavy as boulders to send me home but I continue to stay in power," he added.

Prosecutors are expected next week to request that Berlusconi stand trial for abuse of power in a case involving an alleged underage prostitute.

He has repeatedly dismissed the allegations as a plot by prosecutors.

Berlusconi on Friday instead emphasised his plans to speed up Italy's sluggish economic growth, saying he would give the economy "a major boost".

"At a cabinet meeting on Tuesday we will launch an extraordinary plan to give a boost, a major boost, to the Italian economy," said the prime minister.

He said this would raise growth to an annual 4.0 percent within three years.

He also said that Italy's left-wing opposition "is only held together by the stubborn will to do away with me using all licit and above all illicit means."