Background: The League triggered a political crisis in Italy on August 8 when it asked for a new general election, virtually ending its alliance with the anti-establishment Five Star Movement.
M5S and the League party formed a coalition government on June 1, 2018 under the leadership of technocrat Prime Minister Giuseppe Conte.
By filing the no-confidence motion on Friday, Salvini has pre-empted that possibility.
If an election is announced, it will be the first election to be held in autumn by Italy in all of the post-war period.
"The only thing I am interested in is that we fix a date for the election".
Parliament, which is now in its summer recess, could reconvene next week to carry out the necessary steps, Salvini said, referring to the need for a no-confidence vote in the government and the resignation of the premier.
The motion comes after Thursday's quotes from Salvini that the ruling majority no longer exists and called for early elections.
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Backing for Mr Salvini's League has soured over the past year, with recent polls putting it at 36 percent of the vote, with support for M5S dwindling to just 15 percent. "For us the only alternative to this government is to give the choice back to the Italians with new elections".
The heads of Italy's political groups have failed to reach agreement on when to hold a vote of no confidence, amid a government crisis triggered by nationalist leader Matteo Salvini.
Salvini will have answer to parliament for his decision to bring down the administration Conte said: "I am confident that the passage through parliament will shed full light on the decisions made and the responsibilities that derive from them", he added.
With parliament closed for the summer holidays, Salvini has been waging an unofficial election campaign on Italian beaches, a flawless venue for his down-market, "man-of-the-people" persona.
President Sergio Mattarella has insisted there must be a government in place to finalise the budget, a first draft of which has be submitted to European Union authorities by the end of September.
An election in October would be unheard of and potentially complicate drawing up of the budget at a time when market volatility is already high and rising, pushing up Italy's borrowing costs even more.
At the time of the general election, the left-wing Five Star was the senior partner and largest party in Italy with 32 per cent of the vote, while the strongly pro-border control league took just 17 per cent. It has almost twice as many seats as the League Party in the lower chamber of parliament.
Besides the high-speed rail-link, the League listed other areas of contention between the two parties, including fiscal policies, energy, justice reform, regional autonomy and relations with Europe.