Theresa May's grip on power appears far from secure, despite a potential deal with the Democratic Unionist Party to support her in Parliament.
Downing Street initially said an outline agreement on a "confidence and supply" arrangement had been reached with the DUP which will be put to the Cabinet for discussion on Monday.
But no deal has yet been finalised and talks on the arrangement will continue during the week as May desperately tries to shore up her position after losing her Commons majority in the election.
The strength of any deal looks set to be tested when the Commons meets, with Jeremy Corbyn vowing to try to bring down the Government by defeating Ms May in Parliament and insisting: "I can still be Prime Minister."
In another sign of the dangers facing Ms May, Sunday papers reported that Boris Johnson was either being encouraged to make a leadership bid in an effort to oust her, or actually preparing one - a claim dismissed as "tripe" by the Foreign Secretary.
The 10 DUP MPs could prove crucial in supporting the Conservatives on key votes after Thursday's election saw May lose control of the Commons.
A confidence and supply deal would mean them backing the Government on its Budget and confidence motions, but could potentially lead to other issues being decided on a vote-by-vote basis.
The talks were in line with DUP leader Arlene Foster's "commitment to explore how we might bring stability to the nation at this time of great challenge", her party said in a statement.
"The talks so far have been positive. Discussions will continue next week to work on the details and to reach agreement on arrangements for the new Parliament."
Number 10 had earlier said: "We can confirm that the Democratic Unionist Party have agreed to the principles of an outline agreement to support the Conservative Government on a confidence and supply basis when Parliament returns next week."
Following talks between Ms May and the DUP on Saturday night, a second statement confirmed that no final deal had been reached.
"The Prime Minister has tonight spoken with the DUP to discuss finalising a confidence and supply deal when Parliament returns next week," a Downing Street spokeswoman said.
"We will welcome any such deal being agreed, as it will provide the stability and certainty the whole country requires as we embark on Brexit and beyond.
"As and when details are finalised both parties will put them forward."