Theresa Villiers says Westminster welfare plan unrealistic
4 April 2014 Last updated at 18:41 BST
The Secretary of State Theresa Villiers has said the prospect of Westminster taking powers to legislate for welfare changes in NI is not realistic.
First Minister Peter Robinson suggested devolved powers for social welfare could be handed back if the Stormont parties failed to reach agreement.
In response, Mr McGuinness said Mr Robinson had "crossed the line" by saying they had reached agreement on welfare reform.
Gareth Gordon reports.