The Committee is an arm of Parliament. It can't enforce any sanctions. That can only happen if the Commons approves its findings (and let's not forget that the Commons has a thumping Tory majority). His behaviour towards the Committee could be judged as having been in contempt of the Committee, by extension contempt of Parliament itself. It would be unconscionable were he to be able to say whatever he liked about the Committee, no holding back, with no sanction available. By saying what he's said, he is holding the electorate in contempt and he is attempting to undermine democracy. It's as bad as that, Nigel. In any case, the Commons has the power to amend the report's suggested sanctions or to reject it altogether. I've done a fair bit of googling and, so far, I've seen the "beyond remit" argument put only by Johnson and a few of his backwoods allies - and you! Your googling may differ, and probably does... but be careful who you side with!