Lo and behold, the snap election that May called two months ago has now denied her Conservative Party a majority, resulting in a hung parliament. The Conservatives "have lost their majority and the prime minister has lost all authority and credibility", said Scottish First Minister Nicola Sturgeon.
May called the DUP her "friends and allies", and aims to have an informal partnership with them to govern.
Mrs May insisted only the Tories and the DUP have the legitimacy to form a government and hailed their "strong relationship".
May's party fell short of an overall majority following Thursday's vote, and plans to work with Northern Ireland's Democratic Unionist Party.
She also confirmed to German Chancellor Angela Merkel in a phone call yesterday that Britain was ready to begin Brexit negotiations "as planned in the next couple of weeks", reassuring European Union leaders who had expressed doubts after May's electoral losses.
"Theresa May is certainly the strongest leader that we have at the moment", David Jones, a junior Brexit minister, told the BBC.
The Prime Minister's campaign was widely criticised for not engaging with voters and stumbling on key issues.
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To reach a majority, a party has to secure 326 seats - while the Conservatives have secure 310 seats, the Labour party is behind at 258 seats.
The Conservatives recorded their best result in Burnley for 25 years as Paul White finished second to Labour. As of Friday afternoon, with one constituency yet to declare, the Conservatives remain the largest party with 318 seats, having lost 12 seats, and Labour with 261 seats.
The Times of London said in an editorial that "the election appears to have been, among other things, a rejection of the vague but harshly worded prospectus for Brexit for which Mrs". But that won't help May much, because she intentionally ensured that little of substance about Brexit was included in her party's manifesto. He said voters had rejected her Brexit plan.
Ruth Davidson, leader of Conservatives in Scotland, where the party did well, said the results showed that the Conservatives should prioritise good trade relations with the European Union.
"The Conservatives have not yet broken the British system of democracy, but through their hubris and incompetence they have managed to make a mockery of it", it said in an editorial.
A deal between the government and the DUP could also unsettle the precarious balance between Northern Ireland's British loyalist and Irish nationalist parties.
EU Budget Commissioner Guenther Oettinger said it may now be possible to discuss closer ties between Britain and the EU than May had initially planned, given her election flop.
Senior party figures have cautioned against any immediate leadership challenge, saying it would cause only further disruption as Britain prepares to start the Brexit talks as early as June 19.