Talks about forming a new government in Italy resumed after populist and left-wing leaders agreed to give Giuseppe Conte the post of prime minister.
The Five Star Movement and the Democratic Party (PD) have until Wednesday morning to form a coalition.
If they fail, President Sergio Matarella will appoint a government as guardians and call early elections.
Negotiations were terminated earlier when Five Star said it would not continue unless the PD said "yes to Conte".
"I'm tired of playing games," said five-star party leader Luigi Di Mayo. But he later welcomed what he described as ND's willingness to accept Mr Conte's re-appointment.
PD leader Nicola Zingaretti tweeted that while the talks were "positive", there was a need for "mutual listening" on both sides in order to make further progress.
How did we get here?
Both parties have been in discussions since Mr Conte resigned as prime minister last week in a dramatic way.
His decision came after Mateo Salvini, the leader of the Nationalist League party, filed a motion of no confidence against him.
During his resignation speech of 20 August, Mr Conte launched a fierce attack on Mr Salvini, accusing him of 'irresponsibility'.
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Mr Salvini's League Party was in power with the anti-Atlantic five-star movement for 1
Mr Conte, an independent professor of law, remains as leader of care as the talks for the formation of a new government continue.
After his return to Italy from the G7 summit in France, he even received approval. of US President Donald Trump in a misspelled tweet.
What are the end points?
In addition to who will become Prime Minister, there are significant policy differences:
- With regard to the key Five Star request to cut 345 parliamentarians, the PD can only agree to this in relation to a broader constitutional reform
- Both countries are also expected to have differences in Italy's 2020 budget, which will have to comply with EU deficit rules. Italy is the third largest economy in the euro area, but with 132% it has the second largest debt in proportion to its output.
- The center left will seek the return of many of the League-sponsored immigration measures that led to the closure of migrant ports. Although they were pushed by Mateo Salvini, the Five Star eventually agreed.
If the two parties fail to reach an agreement, the fall election seems likely that Mr Salvini's nationalists will strive for victory.
Why is Salvinie enough?  After weeks of animosity between the two ruling parties, Mr Salvini called for early elections earlier this month, saying that differences with his five-star coalition partners could not be corrected.
The unsuccessful attempt by Five Stars to overturn plans for high-speed rail showed that the coalition could no longer rule, the right wing leader said at the time.
However, addressing his senate last week, Mr Conte said Mr Salvini was "seeking a pretext to return to the ballot box" after the success of his party in the European elections in May.
The league pops up in front of five stars in opinion polls, mainly because of Mr. Salvini's stance against illegal immigration, but
In the May elections, the League led by 34% of the vote in Italy, while Five Star received about 17%.
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However, Mr Di Mayo has stated that his party is not afraid of another election.
If the Five Star Parties and the PD agree on a new coalition deal before Wednesday's deadline, Mr Salvini's proposal to tighten his party's grip on the League will not fail.