Not just Cumming, but the ERG as a whole. For reasons you state.
Oopsminty, the UK is asking the EU to negotiate the un-negotiable - to give in on basic principles which are immuable- and the ones Johnson himself signed and asked the House to countersign. Including the level playing field and the border between UK and EU which would leak like a sieve if it is not tight. That cannot move- Mrs May knew it well, and so did Johnson - and his Deal was quite a bit worse than hers. It is all nonsense- and clearly because that it what they always wanted. They lied and lied, because they knew no-one would vote for huge price hikes, for our agriculture industry to be destroyed (and it is massively bigger than fisheries- most of which have been sold to large foreign concerns anyhow), shortages of food and massive shortages of essential, life saving medicines and treatments, etc, etc.