Ciaran Cunningham from the Republican Network for Unity has said that:
Martin McGuinness has lost all logic and he lost all sense and he has lost all respect.
Martin McGuinness is playing with words, he's trying to make the word Republican mean something that it doesn't mean.
In an historic encounter, the Queen has shaken the hand of Sinn Fein's Martin McGuinness.
Today's handshake between the Queen and former IRA commander Martin McGuinness is a historic gesture of peace. Here are some others.
The hands of history? The Queen and former IRA Commander Martin McGuinness will make a remarkable gesture for peace today.