Top Democrat warns Trump firing of Mueller could provoke 'constitutional crisis'

Mark Warner, the top Democrat on the US Senate Intelligence committee, says that if Donald Trump fires Special Counsel Robert Mueller, "it has the potential to provoke a constitutional crisis." Video: Reuters

100 days of the Government

Political Editor of The Irish Times, Pat Leahy, reviews the beginning of Micheál Martin‘s second term as Taoiseach. Video: Dan Dennison