"We evaluated a very complicated and complex situation and decided to go before parliament as soon as possible," Letta told Italian television shortly after meeting yesterday day with President Giorgio Napolitano.
The crisis was sparked when Berlusconi's centre-right People of Freedom (PDL) party pulled its ministers out of the barely five-month-old coalition government.
The shock move "created an obvious climate of uncertainty," Napolitano said in a statement after meeting with Letta for an hour and a half, adding that the two agreed to seek "clarification" before parliament.
The centre-left premier added: "If I do not get it, I will draw my conclusions... I don't intend to govern at all costs."
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Berlusconi, facing removal from the Senate because of a conviction for tax fraud, spurred all five PDL ministers to resign on Saturday.
The move was ostensibly sparked by Letta's refusal to discuss delaying an increase in the value-added tax while tensions were at a fever pitch over Berlusconi's legal woes.