Salvini is also seeking allies, both in the Senate and for possible elections, from former premier Silvio Berlusconi's Forza Italia and the post-fascist Brothers of Italy of Giorgia Meloni.
The Italian senate has opted to summon the prime minister, Giuseppe Conte, to parliament on 20 August to respond to the crisis facing his government after one of the coalition's members withdrew its support. Mr Salvini pulled the plug on his populist coalition and now wants an urgent confidence vote and elections.
Former Democratic Party (PD) leader Renzi said "I decided to make an appeal to the political forces which has the possibility of being met today".More news: USA airline regulator bans Macbook Pro models with recalled batteries
A Senate vote on the schedule for the government crisis will show a "possible" accord, ex premier Matteo Renzi said in a press conference ahead of the vote in the Upper House Tuesday.
While the government is still in place, the Senate decides whether to initiate a no-confidence vote in the 14-month-old administration of Conte, an independent approved by deputy prime ministers Salvini and M5S leader Luigi Di Maio a year ago.
Di Maio, who is not a senator, welcomed Salvini's offer to back the M5S reform, but said it was up to President Sergio Mattarella to decide on elections.
"Let's vote the cut of 345 parliamentarians and then let's hold an election immediately", Salvini suggested during the noisy Senate session. Salvini, in a surprise move, instead announced that his party was willing to first complete passage of a law thought would drastically reduce the number of lawmakers in future legislatures. The strategy aims to delay an early election, at least until after painful budget cuts are made to avoid triggering sales tax hikes.More news: Jack Leach says call-up for Ashes can only be win-win situation
An alliance with the 5-Stars risks deepening already bitter divisions within Renzi's party, which is now Parliament's largest opposition force.
Just a year ago, the anti-establishment 5-Star rebuffed the center-left Democrats in favor of the anti-migrant League, forging a coalition to bring Europe's first all-populist government into power.
The possibility of a deal between Renzi and the 5-Star Movement poses challenges for the Democratic Party.
"Italy would certainly go into recession".More news: Hong Kong: flights resume at airport after clashes between protesters and police