Donaldson resignation will prompt fresh questions for DUP and powersharing

(l to r) Jeffrey Donaldson, Gavin Robinson and Emma Little-Pengelly leave Hillsborough Castle in January (Liam McBurney/PA)

The deal that restored powersharing in Northern Ireland hinged on the backing of Jeffrey Donaldson and the shock resignation of the DUP leader is sure to prompt questions over the future of that arrangement.

Much will depend on who ultimately replaces him.