Former Northern Ireland First Minister Peter Robinson taken to hospital after

The spokesman said Mr Robinson was doing well and would be discharged from hospital soon.

The 66-year-old was taken to Belfast’s Royal Victoria Hospital on Saturday after an adverse reaction to new medication he was prescribed following a heart attack in May.

A spokesperson for the health trust said he was admitted as a precaution and was “comfortable and doing well”.

Deputy First Minister Martin McGuinness of Sinn Féin took to Twitter to wish Mr Robinson well.

Mr Robinson spent four nights at the RVH in May after suffering a suspected heart attack and had three stents fitted to help the flow of blood.

At the time, the DUP leader blamed his lifestyle for his illness and described it as a “warning”.

“The DUP leader will be at Stormont tomorrow morning [Monday] where he will meet party colleagues regarding the talks process”.

Mr Robinson’s resignation has plunged Northern Ireland into its worst crisis in almost a decade.

The DUP said yesterday that Peter Robinson’s unexpected admission to hospital was due to a reaction to medication.

Political rivals had expressed concern and wished him a speedy recovery.

On Sunday night, the spokesman said: “Mr Robinson was discharged from the Royal Victoria Hospital earlier this evening”.

“He is comfortable and is doing well”.

He has been under considerable pressure in recent months as he has sought to deal with the political crisis caused by the police assessment that the IRA still exists and that some of its members were involved in the murder last month of Belfast republican Kevin McGuigan although acting without the authority of the IRA leadership.

The powersharing Executive at Stormont is teetering on the verge of collapse after all but one of the unionist ministers pulled out.

Unionists had demanded British government action on paramilitaries before the talks could begin.

Ulster Unionist Party (UUP) leader Mike Nesbitt said: “It is concerning to hear that Peter has been admitted to hospital”.

The focus by the DUP, Dublin, London and the main parties in these plenary talks will be on addressing two key issues: the fallout from the murder of Mr McGuigan, and the deadlock over welfare reform.