Her hope is she will finalise a deal between the DUP and the Tories.
The DUP has signed a deal with the Conservatives to support Theresa May's minority Government, sparking an angry reaction from rival parties. This meant that no political party had a majority in the House of Commons (which most parties need so they can rely on the majority of MPs voting in favour of their laws) so there was a hung parliament.
The talks between the two parties centred on Brexit and financial support for Northern Ireland and Brexit.
"The DUP has acted in the best interests of all the people of Northern Ireland and in the national interest of the United Kingdom".
The deal will face its first test in parliament with a confidence vote expected on Thursday.
Sinn Féin president Gerry Adams said the Democratic Unionist Party commitment to support any deal on the United Kingdom exiting the European Union was a "blank cheque for a Tory Brexit which threatens the Good Friday Agreement".
The documents were signed in Downing Street by lesser figures. Her Brexit strategy is under scrutiny and her future as prime minister is the subject of public debate.
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It involves giving Northern Ireland an extra £1 billion in Government funding, with the extra cash to be spent on hospitals, schools and roads in the region. People in Northern Ireland voted to defend our position in Europe, we will not quietly acquiesce to a Tory Brexit.
The DUP has claimed that the Tories had agreed to improve the way military veterans were treated in Northern Ireland.
Prime Minister May and DUP leader Arlene Foster went ahead with the "confidence and supply" agreement in spite of warnings from prominent Conservatives such as Lord Patten, a committed Catholic, that the DUP is a "toxic brand" that will make the Conservatives look like the "nasty party".
In an annex outlining the deal, the government said it "recognizes that Northern Ireland has unique circumstances within the United Kingdom, not least as a effect of responding to challenges of the past", and would therefore allocate 50 million pounds a year for two years "to address immediate pressures in health and education".
The Conservatives had said in their election manifesto the triple lock would be dropped from 2020 and replaced with a "double lock", which would see state pension payments rise in line with the greater inflation or wage growth.
The UK Government will continue to support close co-operations with the Irish Government and work with them in accordance with the Belfast Agreement and subsequent agreements, while recognising that ultimate responsibility for political stability in Northern Ireland rests with the UK Government.
Some Conservatives have raised concerns about linking up with the DUP because of its opposition to same-sex marriage and abortion.
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