The Conservatives lost their parliamentary majority in Thursday's election.
The socially conservative, pro-Brexit Democratic Unionist Party's 10 seats give the right-wing Conservatives a fragile but workable majority, which May said would allow her to negotiate a successful exit from the EU.
"As we're the party that won the most seats and most votes we are the only party in a position to form a government", Ms May said.
Voters are choosing all 650 members of the House of Commons after May called a snap election, three years ahead of schedule, at a time when her party was well ahead in the polls.
After a brief meeting with Queen Elizabeth II at Buckingham Palace, May said this morning the new government will guide Britain's exit talks from the European Union, which are set to begin in just 10 days. While many wondered whether May would resign as PM, the British newspapers reported she was trying to form a minority government with the help of the DUP, a party that wants to make sure, among other things, that Northern Ireland is not given special status in Brexit and left with one leg still in the EU. "I expect more uncertainty now". And if the parties can't sync up to form a majority government, there might even be a whole new election.
"Absolutely", Corbyn told Sunday Mirror newspaper in an interview.
May "is in a very hard place. she now has to obviously consider her position".
As a Conservative, I am of course disappointed to see the party lose seats in yesterday's General Election, especially Ben Howlett who was a champion for equality, in particular in his role on the Women and Equalities Committee.
The results confounded those who said the opposition Labour Party's left-wing leader, Jeremy Corbyn, was electorally toxic. "This is a very bad moment for the Conservative Party, and we need to take stock", Conservative lawmaker Anna Soubry said. No, Dunt said, but May's vision of a so-called "hard Brexit" - in which the United Kingdom would most likely leave the single European Union market, take full control over its borders, strike new trade deals and apply laws within its own borders - has been rejected.
"We put forward our policies - strong and hopeful policies - and they've gained an awesome response and traction", he said. After all, it was a Conservative Prime Minister who introduced same-sex marriage in England and Wales and, in 2015, his bold decision was rewarded at the ballot box.
May, who went into the election with a reputation for quiet competence, was criticized for a lackluster campaigning style and for a plan to force elderly people to pay more for their care, a proposal her opponents dubbed the "dementia tax". "I wouldn't necessarily say it's at the top".