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
Celebrity Big Brother fans have criticised the show for airing footage of Janice Dickinson having a fit after being stung by a bee.
An STV survey finds that 53% of Scots would vote in favour of independence if a referendum were held tomorrow.
Singer Dolores O'Riordan is receiving residential medical care as she awaits trial over an alleged air rage incident, a court has heard.