Martin McGuinness has said that he is concerned to hear that First Minister Peter Robinson has been taken to hospital with a suspected heart condition.
In a tweet from his official account, the Northern Ireland deputy First Minister said that his "thoughts and prayers" were with Mr Robinson and his family.
David Cameron has wished the First Minister of Northern Ireland Peter Robinson a "speedy recovery" after he was admitted to hospital with a suspected heart condition.
Peter Robinson, the First Minister of Northern Ireland, has been rushed to hospital after suffering a suspected heart attack.
Mr Robinson, 66, was taken by ambulance to Belfast's Royal Victoria Hospital at just after 9am this morning.
Senior DUP sources confirmed the party's leader was being treated for a suspected heart complaint.
A hospital spokeswoman said: "Mr Robinson underwent a procedure this morning and is currently recovering in the Royal Victoria Hospital."
A DUP spokesperson said: "The First Minister felt unwell this morning and has been admitted to the hospital for some further tests."
Northern Ireland's First Minister Peter Robinson has made a public apology for any offence caused to Muslims by his defence of Pastor James McConnell.
Former Prime Minister Tony Blair engaged in a "deliberate deception by omission" by failing to tell the majority of politicians in Northern Ireland about the agreement his government struck with Sinn Fein to deal with on-the-run republicans, Stormont's First Minister has said.
Peter Robinson heavily criticised the conduct of the previous Labour administration as he addressed an emergency meeting at Stormont to debate the controversy over letters sent to more than 180 terror suspects informing them the authorities in the UK were not seeking them.
"The answer that there were no plans to legislate and no amnesty would be introduced was a deliberate deception, a deception by omission, for the Government could easily at that stage have indicated that there was an administrative process which included giving letters to OTRs," he told MLAs.
Stormont's Deputy First Minister Martin McGuinness said should the First Minister resign it would achieve "absolutely nothing".
Asked what he thought of Peter Robinson's threat to leave his post, he said: "I have to ask the question, what would that achieve?
"It could lead to an election and Sinn Fein has no difficulty with elections ... but what would that achieve? In my view absolutely nothing."
Mr McGuinness urged politicians to "stop the grandstanding" and stressed "steady leadership, responsible leadership" is needed going forward.
The collapse of the 1982 Hyde Park bombing case has sparked a crisis in the judicial system according to Northern Ireland First Minister Peter Robinson
Mr Robinson said: "We're not on the brink of a crisis, we are in a crisis. This is a crisis. How could you have anything more than the setting aside of the proper judicial processes, where justice is not going to be done for at least 187 people?
"It is a crisis of confidence that the people of Northern Ireland will have on the policing and judicial processes in Northern Ireland and they are right to be angry."
Northern Ireland First Minister Peter Robinson has threatened to resign over the collapse of the case over the 1982 Hyde Park bombing and saying his administration have been deceived by Westminster.
Mr Robinson told UTV News he was "not prepared to remain as First Minister of an administration that kept us in the dark, that is being deceived by government, both past and present."
Northern Ireland First Minister Peter Robinson said he was "not prepared to be a stooge" for the Westminster government, accusing them of "keeping secrets" on matters devolved to the Northern Ireland Assembly.
His party, the Democratic Unionist Party, expressed his thoughts on Twitter.
Northern Ireland First Minister Peter Robinson indicated he was prepared to resign unless there was a judicial inquiry into the collapse of the John Downey case, saying:
"I have to say quite frankly that I am not prepared to be the first minister of a government that is kept in the dark on matters that are relevant to what we are doing."