Well, according to the BBC (
https://www.bbc.co.uk/news/uk-politics-64823710) he said "I'm going to find it very difficult to vote for something like this myself, as I believe we should have done something different."
The deal would act as a "a drag anchor on divergence" from the EU, he added.
"Brexit is nothing unless we in this country don't do things differently."
Don't think I understood any of that really.