He acknowledged that the government would now be unable to get numerous measures promised in its election platform through Parliament.
May's majority in parliament until the snap election was only held by 17 seats, but now she is at a considerable disadvantage. Every decision she makes will be subject to compromise with another party.
May also promised her government will "keep our nation safe and secure", after recent attacks in London and Manchester, by "cracking down on the ideology of Islamist extremism and all those who support it and giving the police and the authorities the powers they need to keep our country safe". May will face the tall task of first fending off challenges to her own leadership and then attempting to negotiate a satisfactory Brexit with a razor-thin majority.
Opposition leader Jeremyn Corbyn said his party would vote down Mrs May's Queen's Speech - or programme for government, when she presented it to Parliament - and another election might be needed to break the deadlock.
After a brief meeting with Queen Elizabeth II at Buckingham Palace, May said Friday the new government will guide Britains exit talks from the European Union, which are set to begin in just 10 days.
Democratic Unionist Party deputy leader Nigel Dodds, at right, and leader Arlene Foster, celebrate Dodds winning his Belfast North seat.
"Our two parties have enjoyed a strong relationship over many years, and this gives me the confidence to believe that we will be able to work together in the interests of the whole United Kingdom", May said.
The prime minister spoke to German Chancellor Angela Merkel on Saturday and confirmed she was ready to start Brexit talks "as planned in the next couple of weeks".
She left without taking any questions from the assembled media, or without explaining the extent of the discussions with May.
He said the Conservative election manifesto - which Hill and Timothy were key in drafting - was "a full assault on the core Tory voters, who are senior citizens".
However, the general elections have failed the conservatives and took away her majority in the government, forcing her to collaborate with DUP. Meanwhile, the Labour Party started the campaign looking as if it was maybe facing some sort of existential disaster. "I will happily eat my new Brexit book if they do", he had tweeted.
The stunning election result comes after a campaign in which May lost popularity over her style and some of her social care policies, including a so-called "dementia tax" that would force the elderly to pay more for their care.
"There has been a lot of hyperbole about the DUP since Thursday, a lot of things said", DUP leader Foster told Sky News.
Defence Secretary Michael Fallon, a member of May's Conservative party, told the BBC: "What we do have now is an understanding of the outline proposals that would underpin that working agreement".
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