The Government was today found to be in contempt of the rules of Parliament for not publishing the Attorney General's full legal advice on Brexit.
The Labour motion was passed with a majority of 18 votes. Sir Keir Starmer said the result was "of huge constitutional significance."
He called for the Government to publish the full legal advice on Brexit as soon as possible.
After the vote Sir Keir posted online: "Today’s finding of contempt is a real low point for this Government. By treating Parliament with contempt, the Government has lost the respect of the House."
Andrea Leadsom, the Commons leader, says the full legal advice will be published tomorrow. She has also asked the privileges committee to investigate the issues that arise from this.
Opposition parties had argued that by not getting the full details of the deal, ministers ignored a Commons vote which called for the full legal advice to be available.
An overview of the legal advice was published by Attorney Geoffrey Cox on Monday.
MPs from the Labour Party, Liberal Democrats, the SNP, DUP, Plaid Cymru and the Green party had all signed a motion demanding the release of the full legal advice.
It comes as Theresa May prepares for her deal to face the Commons vote on December 11.
She has argued that the deal is the best for Britain and delivers on the 2016 referendum result.
On Sunday, Michael Gove warned MPs against voting against the deal, saying that “there could be a second referendum or no Brexit at all.”