Comments follow recent war of words between North Korean leader Kim Jong-un and the US President Donald Trump over their respective nuclear weapons capability.
Former president presented copy of 'Laudato Si: An Irish Response' to Pope Francis during meeting between the Pontiff and the Elders in the Vatican on Monday
Bishop of Down and Connor speaks in support of EU describing it as "a highly calibrated political architecture, unique on the face of the earth and in human history".
Pontiff “has truly captured the imagination, hearts and minds" of the people of Ireland.
Archbishop Diarmuid Martin among the 5,000 participants from 110 countries.