From BBC live:
Jim Pickard(@PickardJE)

Mogg just told ERG meeting that (having met Nigel Dodds earlier today) his understanding is DUP will only vote against government in a no-confidence vote IF the withdrawal agreement gets Commons approval next week - not if it’s rejected

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Let me get this straight. The DUP are confident in May if she fails to achieve what she set out to do. On the other hand, if she succeeds they will not be confident in her.