First Minister Peter Robinson said he was glad the deputy first minister had accepted the invitation.
We recognise that this will be a difficult ask for Her Majesty the Queen and a significant step for republicans.
The process has required us all to reach out and take decisions outside our comfort zone.
It is the right decision and a step forward for Northern Ireland.
More top news
Interference from Christmas fairy lights can slow down broadband connections in the home, energy regulator Ofcom has warned.
As world leaders discuss emissions targets in Paris politicians in the UK want Heathrow to demonstrate it can meet pollution limits.
Under the new rule adults over the age of 18 automatically become donors after their death, unless they opt out beforehand.