The office of President Giorgio Napolitano said Italy wanted an agreement based on "international law".
President Giorgio Napolitano will begin formal consultations with party leaders next week to explore coalition options.
By May 15, when President Giorgio Napolitano's mandate expires, a new president must be elected.
President Giorgio Napolitano appointed 10 eminent figures and now they have submitted a reform plan to him.
On Saturday, Letta, a center-left politician, accepted a mandate to form a government from President Giorgio Napolitano.
President Giorgio Napolitano said he appreciated their "sense of responsibility" and said Italy would remain by their side.
Italian President Giorgio Napolitano is consulting political leaders on forming a government after last month's inconclusive election result.
Later on Saturday, the Pope is due to hold a farewell meeting with the Italian President Giorgio Napolitano.
On February 6th, 13 days after the fall of Romano Prodi's centre-left government, President Giorgio Napolitano dissolved parliament.
Now it's up to President Giorgio Napolitano to either call an election or set up an interim government.
Rather than dissolve parliament and call an election, President Giorgio Napolitano could decide to install a transitional, cross-party government.
President Giorgio Napolitano has warned that failure to agree would have serious consequences.
President Giorgio Napolitano signed it into law, prompting one opposition leader, Antonio Di Pietro, to call for his impeachment.
ECONOMIST: A farcical failure to register candidates in time
In the afternoon, the Vice President will host a lunch meeting with President Giorgio Napolitano of Italy at Blair House.
President Giorgio Napolitano is to step down at the end of his seven-year term, after failing to form a new cabinet.
Later in the morning, the President will host President Giorgio Napolitano of Italy for a bilateral meeting in the Oval Office.
Later this week Mr Bersani is expected to report back to Italian President Giorgio Napolitano, who will decide how to proceed.
Italian President Giorgio Napolitano has pardoned a US Air Force colonel convicted in absentia over the rendition of an Egyptian imam in 2003.
BBC: Italy Abu Omar rendition: Col Romano pardoned in CIA case
His cabinet approved a decree which, had it been countersigned by President Giorgio Napolitano, would have forced Ms Englaro's doctors to continue treatment.
The Queen and Prince Philip had been due to spend two days in Rome this weekend, at the invitation of Italy's President Giorgio Napolitano.
Speaking on TV, the prime minister said he would have preferred to call early elections but the final decision rested with President Giorgio Napolitano.
Mr Berlusconi was even rebuked by Italy's head of state, President Giorgio Napolitano, who said that democratic Italy knew that Fascism was an "aberration".
Italy's FTSE MIB index climbed 1.7% after the Italian Parliament's vote to give Giorgio Napolitano another term as president provided a sense of political stability.
Next weekend, she had been due to spend two days in Rome with the Duke of Edinburgh, at the invitation of Italy's President Giorgio Napolitano.
Italian President Giorgio Napolitano joined President Obama today in the Oval Office for a discussion about the deep and abiding friendship between our two countries.
Italy's octogenarian president, Giorgio Napolitano, had dismissed the surge in support for Grillo, saying the only boom he knows was the economic one in the mid-80s.
CNN: Beppe Grillo: Clown prince takes Italian election by storm
Italy's octogenarian president, Giorgio Napolitano, has dismissed the surge in support for Grillo, saying the only boom he knows was the economic one in the mid-80s.
Italian President Giorgio Napolitano is walking the political tight rope.
FORBES: Italian President Giorgio Napolitano Is Trying To Avert A Crisis Of Systemic Proportions
The exchange prompted President Giorgio Napolitano to call for calm.
BBC: Silvio Berlusconi 'avoiding justice', demonstrators say
He says he will represent the Five-Star Movement in the government formation negotiations that President Giorgio Napolitano will manage as soon as the new parliamentarians have taken their seats.
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