has announced that Prime Time presenter David McCullagh will take over her duties in co-hosting the news with Caitriona Perry.Director of RTÉ News and Current Affairs Jon Williams announced the decision on Friday describing David as one of Ireland’s ‘most formidable journalists.’‘For seven years, at Prime Time, he’s sought answers from scientists to Taoisigh, moderating – with Miriam – our Election 2020 Leaders’ Debate, and helping the programme reach some of the biggest audiences in its history