Northern Ireland's deputy first minister Martin McGuinness has called on the first minister to "step aside" to allow an investigation into a controversial green energy scheme.

Arlene Foster set up the Renewable Heat Incentive when she was enterprise minister.

Opposition parties claim the government now faces a 400 million pound bill after overspending on the project.

In a statement a spokesman for the DUP says the First Minister will NOT be stepping aside and is focused on ensuring the full facts about the issue emerge.