Key word there being 'reassurance'
- If backstop is used, it would only be temporary
And that's about as far as they will ever go to helping May get her Brexit deal across the line with the UK parliament. They'll be able to provide assurances that it will be temporary and that if there ever needs to be an extension, it would require a comprehensive reason to do so. But all of that will fall short of being legally-binding, which is what UK MPs are seeking at the moment.