Boris Johnson's Brexit deal is threat to peace in NI - that's the warning from former MP Tony Blair

Boris Johnson's Brexit deal is threat to peace in Northern Ireland - that's the comments from former Prime Minister Tony Blair. Writing for the Guardian Mr Blair said that the Good Friday Agreement would never have been signed without a commitment to an open border between Northern Ireland and the Irish Republic. Stephen got reaction from former DUP MLA Nelson McCausland and commentator Brendan Mulgrew.