Silvio Berlusconi has launched a fierce attack on magistrates at a stormy political rally, accusing them of trying to eliminate him politically but he pledged to keep supporting the fragile coalition of centre-left Prime Minister Enrico Letta.

We intend to continue to support this government

The leader of Italy’s centre right, whose appeal against a tax fraud conviction was rejected last week and who still faces trial on charges of paying for sex with a minor, repeated his longstanding accusations against prosecutors.

“Anyone who is not caught up by political factionalism can see clearly that there are politically motivated magistrates who are blinded by hate and prejudice towards me,” he said.

His speech late on Saturday was frequently interrupted by whistles and jeers of “In jail! In jail!” by rival demonstrators as well as chants of “Silvio! Silvio!” by supporters of his centre-right People of Freedom party.

Police intervened to keep rival groups apart and there was no sign of serious violence.

The rally added to the simmering tensions within Letta’s uneasy coalition between traditional rivals on the left and right, which was formed after the inconclusive national election in February left no party able to govern alone.

However, Berlusconi said there was no prospect of him withdrawing support from Letta, who he said had promised to accept the centre right’s demand for billions of euros of tax cuts.

“They thought I could pull out and put the survival of the government at risk,” he told a rally in Brescia. “But as always they were mistaken. We intend to continue to support this government.”

Berlusconi is not a minister in Letta’s coalition, but plays a decisive behind-the-scenes role and could bring down the government if he were to withdraw support in Parliament.

The parties are already at loggerheads over Berlusconi’s demands to scrap an unpopular housing tax and calls by Cecile Kyenge, Italy’s first black minister, for citizenship rights for children born in Italy of migrant parents.

The 76-year-old media tycoon faces a new hearing today in his trial on the charges of paying for sex with nightclub dancer Karima El Mahroug, alias “Ruby the Heart stealer” when she was under the age of 18.

In addition, Naples prosecutors called for him to face trial on separate charges of bribing a senator to defect to his party in order to help bring down the government of former centre-left prime minister Romano Prodi, which fell in 2008.

Berlusconi’s legal battles and his frequent attacks against magistrates have fuelled the unease which many on the centre left feel about being forced to join forces with their main rival of the past two decades.

Leading members of Letta’s Democratic Party (PD) criticised the rally in Brescia and in particular, the decision by Interior Minister Angelino Alfano, from Berlusconi’s People of Freedom, to attend a demonstration against state prosecutors.

“Alfano, the deputy prime minister, is feeding the tensions between the political forces which support the government,” said centre-left Deputy Economy Minister Stefano Fassina.

Letta himself made no direct comment on the rally at a special assembly of PD leaders on Saturday, saying only that his government respected “the independence of the magistrates always, whatever happens”.

Berlusconi, whose alliance has taken a lead in the opinion polls since the vote, has stepped up his battle against magistrates as the end of the Ruby trial approaches.

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