The Lib Dems have launched a Commons bid to attach a new Brexit referendum to the Queen's Speech vote.
An amendment demanding a People's Vote on whatever plan Boris Johnson brings back from Brussels could be tacked on to the vote.
If it's selected by Speaker John Bercow, it could go to a vote early next week.
Lib Dem leader Jo Swinson said: "The Liberal Democrats are the strongest party of Remain and have been the leading voice in the People’s Vote campaign.
“Boris Johnson is determined to have a general election , but the best way to resolve the Brexit chaos is to have a People’s Vote and give the British people the final say about their future.
“The best deal we have is as members of the European Union and we want to give the people the chance to choose to stop Brexit.”
The text of the amendment would "instruct the Government to prepare for a People’s Vote in which the public will have the choice between the latest Withdrawal Agreement and remaining in the European Union."
Thousands are expected to take to the streets in Westminster on Saturday in a march calling for a People's Vote.
Parliament is expected to sit this weekend, for the first time on a Saturday since 1982, in order to chew over whatever Johnson brings back from the crunch summit on Thursday and Friday.
