The Cabinet Manual drawn up in 2010 following the inconclusive result of that year's election states that the incumbent government is "entitled to wait until the new Parliament has met to see if it can command the confidence of the House of Commons, but is expected to resign if it becomes clear that it is unlikely to be able to command that confidence and there is a clear alternative". "So whether they can hold a weak leader in place - tactically, as it were - until they are ready to move, I don't know". He said he regretted not including a pledge to cap total social care costs. And after that, she never really recovered.
From 1922-70 the North returned a solid phalanx of ten to 12 Tory-supporting Unionists.
And the relationship between the Conservatives and its minority government partner, the Democratic Unionist Party, also remains unclear. "This is the time for us to come together as a party", culture minister Karen Bradley told Sky News. And with these deals there's always a price tag attached to them.
Northern Ireland is the only remaining part of the United Kingdom where same-sex marriage is not legal after the DUP used a controversial veto mechanism to block any change to legislation.
Sinn Fein party president Gerry Adams said: "Sinn Fein has never accepted that the British government is impartial or neutral".
The 1998 Good Friday agreement set up power sharing in Northern Ireland, largely ending years of sectarian violence. But few believe she can hang on for more than a few months.
Newspapers fronted with photos of British Prime MinisterTheresa May and others are displayed at a shop in Westminster in London, Saturday June 10, 2017.
"It is clear that the Prime Minister has done a deal with the DUP". This is her opportunity to do so and I urge her to take it immediately. "That's not a matter for me", she said.
Senior Tory figures also cast doubts about May's leadership. They could have asked for a second general election.
However, May faced questions from within the Conservative party ranks over the DUP's attitude to gay rights and women's rights. So as a result, Theresa May is in there, propped up but much weakened.
PARKER: Well, I'm not sure you can make that assumption now.
That timeline now looks even more ambitious than before, not least because May's electoral debacle has emboldened those within her own party who object to her "hard Brexit" approach of leaving the European single market and customs union.
May sought to secure the Conservatives a stronger majority when she called the snap election in April, but will be forced to make a deal to reach the required number of seats, looking to the DUP as the minority partner.
With Home Secretary Amber Rudd, Brexit Secretary David Davis, and Defence Secretary Sir Michael Fallon all retaining their posts, there was speculation any reshuffle could be limited to replacing the eight ministers who lost their seats in the election.
"We want to end austerity and invest in this country and that's what we're going to do".