All but one of the DUP ministers have quit – including First Minister Peter Robinson.
They walked out in a political row sparked by a murder which police are linking to the IRA.
The Prime Minister is urging politicians to go the extra mile to save Stormont.
Meanwhile,
Northern Ireland's new acting First Minister says Sinn Fein’s alleged links to the IRA are “a cancer at the heart of government”.
Arlene Foster says the links between politicians and paramilitaries are a matter that “must be dealt with”.
Ms Foster is this morning beginning her tenure as Acting First Minister after Peter Robinson yesterday stepped aside, amid a growing crisis in Stormont.
She says the new round of talks beginning on Monday must deal with the central issue of the IRA and its alleged link with Sinn Féin:
