Theresa May’s £1billion deal with the Democratic Unionist Party to prop up her minority government is set for a High Court challenge.

Northern Ireland resident and Green Party politician Ciaran McClean will make a bid to two judges today to grant him permission to bring a judicial review over the legality of the deal.

The crowdfunded legal challenge accuses the Government of “buying DUP votes” in order to hold onto power.

Mr McClean, a Co Tyrone father-of three and mental health worker, is pursuing the case as a private individual and has raised thousands of pounds to fund the legal action.

Mr McClean’s case will argue that the "money for votes" agreement breaches the Bribery Act 2010, and amounts to a "corrupt bargain".

The Tories' deal with the DUP, struck in the aftermath of the general election which saw Mrs May throw away her House of Commons majority, guarantees the Prime Minister the support of the party’s 10 MPs on key votes.