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Seeing as May suggested it, there probably isn't a point other than that she hopes to come across better in the debate, i.e. she's recently scored some hits at PMQs and probably thinks she can beat Corbyn on the detail of the 'deal', in which she's been closely involved and he hasn't. His best strategy would probably be to say 'forget the detail, it's the big issues that matter'. I personally think such debates are generally nonsense and a stillbirth of TV-led politics. (Look at how people trust Trump or Johnson because they've both been on TV.)
What's the point of this debate anyway? Seems a bit pointless to have one while a GE / another referendum are still officially off the table.