May said Friday she looks forward to working with "our friends and allies" in the DUP.
Former chancellor George Osborne, sacked from the Cabinet by Mrs May and now editor of the Evening Standard, told ITV: "Clearly if she's got a worse result than two years ago and is nearly unable to form a government then she I doubt will survive in the long term as Conservative party leader".
May's party won 318 seats, 12 fewer than it had before May called a snap election, and eight short of the 326 needed for an outright majority.
She claimed the election result was a "great result for the union" adding "those who want to tear apart the union that we cherish and benefit from so hugely have been sent a clear and resounding message".
He said: "Our experience in 2015 is that the Conservatives got an overall majority despite the predictions of the exit poll and the early results coming in do indicate that the exit poll may not be entirely accurate".
Whereas May has said leaving with "no deal is better than a bad deal", the DUP want a deal and "positive ongoing relationship with the European Union" so they could sway Brexit to be "softer" than the Conservatives would have liked on their own.
DUP Leader Arlene Foster recently denied the party was homophobic.
But in a dramatic twist just before midnight on Sunday, Sky sources said No. 10's account of the talks had been issued in error and the DUP had not yet reached any agreement with the Tories.
Following the deal, Prime Minister Theresa May will shape her new cabinet to form the new United Kingdom government next week.
However, this time the third-party vote collapsed to its lowest level in half a century and Labour benefited more than expected. "Theresa May must not allow the DUP to further weaken her already inadequate manifesto commitments to maintain environmental protections and preserve nature".
Mr Corbyn, speaking after being re-elected in Islington North, said it was time for Mrs May to "make way" for a government that would be "truly representative of the people of this country".
Ms May called this election to boost her parliamentary majority and strengthen her Brexit negotiating hand - talks begin in 11 days.
"They are wrong and they need to understand why we take those positions from a faith point of view and why we want to protect the definition of marriage", she said.
An online petition demanding a Tory-DUP minority government is stopped has amassed more than 580,000 signatures, amid concerns over its stance on gay rights, abortion and the death penalty.
As only people in Northern Ireland can vote for the DUP, a lot is not known about them.
Labour leader Jeremy Corbyn, riding a wave of acclaim for his party's unexpectedly strong showing, called on May to resign.
Meanwhile, Labour has made 29 gains with the Conservatives losing 13 seats.