Labour has said it is “more important than ever” that Parliament is recalled after the government published its no-deal Brexit assessment.
Shadow Brexit secretary Sir Keir Starmer said the Yellowhammer document confirms there are “severe risks” if the UK leaves the EU without a deal.
MPs forced the government to release the file before Parliament was prorogued – or suspended – on Tuesday.
Defence Secretary Ben Wallace said the government was mitigating the risks.
He told BBC Radio 4’s Today programme the planning document only showed what might happen “if the government didn’t do anything about it”.
But he added “lots of measures” were being taken to reduce risks, and the chancellor had “opened his chequebook” for greater no-deal spending.
The planning file was a “living document” and an updated version would be published in due course, he said.
Sir Keir said recalling Parliament would allow MPs “the opportunity to scrutinise these documents and take all steps necessary to stop no-deal”.
His comments followed a ruling by Scotland’s highest civil court on Wednesday that the government’s proroguing of Parliament was unlawful.