But both think that the deal should be accepted now to get the process of Brexit underway and deliver a major part of what the "Leave" side campaigned for.
Tim Montgomerie has an article explaining his position on the CAPX site here.
Michael Gove has written in the Mail here.
I think the most important point he makes is that, as perhaps the foremost critic of those on the "Remain" side who cried wolf by predicting disaster if there was a leave vote in what he thought at the time was Project Fear, he thinks that the warnings of disruption and dislocation if there is a "No Deal" Brexit are genuine: this time the wolf is there.
Don't forget, as some of the "true believers" on the Brexit side have, that the Leave campaign never sought a mandate for e "No Deal" or as the hardliners now disingenuously call it, a "WTO" Brexit. They said they were confident Britain would, while not remaining part of the single market, be able to strike a deal which gave us access to it.
This is what Michael Gove has to say about what happens if the May deal is not agreed,