Italy's three main rightist parties on Sunday vowed to present a united front in a fresh round of talks on forming a new government next week, defying attempts by the anti-establishment 5-Star Movement to divide them in coalition negotiations.

Following last month's inconclusive election, President Sergio Mattarella wrapped up an initial round of consultations on Thursday and promised to meet party leaders again soon to try to break the gridlock and put together a new government.

The March 4 vote saw the anti-establishment 5-Star Movement emerge as the largest single party, while a rightist alliance, including the League, Brothers of Italy and Silvio Berlusconi's Forza Italia (Go Italy!) group won the biggest bloc of seats.