An agreement has been reached which will see the Democratic Unionist Party back Theresa May's minority government.
The deal, which comes two weeks after the election resulted in a hung Parliament, will see the 10 DUP MPs back the Tories in key Commons votes.
There will be £1bn extra for Northern Ireland over the next two years.
DUP leader Arlene Foster said the "wide-ranging" pact was "good for Northern Ireland and the UK" but one critic said it was a "straight bung".
Labour leader Jeremy Corbyn said the deal was "clearly not in the national interest", and Sinn Fein's Gerry Adams said it enabled a "Tory Brexit which threatens the Good Friday Agreement".
It has prompted calls for matching public investment in Wales and Scotland.
A three page document outlining the terms of the agreement has been published in full. The DUP said it would apply for the lifetime of the Parliament, scheduled to last five years, but would also be reviewed at the end of the current session in two years time.
(BBC)