Italian Prime Minister Silvio Berlusconi will face a vote of no-confidence on December 14.
The vote has been organised by Italy’s President Giorgio Napolitano and two senior parliamentarians.
Berlusconi has been battling with former ally Gianfranco Fini, who resigned in July from his People of Freedom party.
Four of Fini’s supporters quit the government earlier this week.
Berlusconi has a slim majority in the Senate but without the support of his former partners no longer enjoys one in the lower house.
If he loses, he will be forced to quit.
The 74-year-old prime minister has also been dogged by a series of sex scandals in recent months.
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