Could Boris Johnson's fate be in the hands of Arlene Foster? And if the DUP do scupper an agreement how will history judge them in the blame game of a no deal #Brexit?

"When would any other country ever give up part of its territory as part of trade talks? This would "completely undermine Northern Ireland's status as an integral part of the UK. We must not go down this route." - the stark concerns from the former Secretary of State Owen Patterson. And as a Tory he is sending his warnings to the government. The DUP has said they will not tolerate staying in the EU customs union. And Arlene Foster said she could not accept reported plans of a customs border in the Irish Sea. So is this a defining day for NI - and its future? Stephen spoke to BBC NI economics and business editor John Campbell, Alliance Party MLA Stephen Farry, DUP MLA Jim Wells and commentator Alex Kane.