MPs must be given “a straight up-and-down vote” on the PM’s Brexit deal later, No 10 says, but it is not clear whether the Speaker will allow it.
John Bercow is due to announce his decision at 15.30BST
The PM Boris Johnson tried to bring his deal to the Commons for a vote on Saturday, but his strategy was dealt a blow when MPs backed moves to delay approval instead.
The Speaker has previously ruled out repeatedly bringing back votes on the same matter more than once.
BBC assistant political editor Norman Smith said Mr Bercow looked set to reject the PM’s demand.
Following Saturday’s special sitting, Boris Johnson was forced to send a letter asking the EU for an extension to the Brexit date – although he did not sign it.
Mr Johnson reached a new deal with the EU last week, but it needs to be approved by the UK Parliament.
He wants MPs to say a clear “yes” or “no” on Monday afternoon, but regardless of whether a vote on the deal is held, the government will introduce the legislation to implement Brexit – called the Withdrawal Agreement Bill (WAB) – later.
Labour’s shadow Brexit Secretary Keir Starmer has said his party will push for changes when the bill is brought to Parliament, for example, demanding a UK-wide customs union with the EU and single market alignment, and ensuring there could not be a no-deal “trapdoor” at the end of the transition period if no free-trade agreement was reached with the EU.
The DUP has so far refused to support Mr Johnson’s deal – and Labour has attempted to reach out to it – but the Northern Irish party’s chief whip, Jim Shannon, told Sky News a customs union was “something that we cannot support and will not support”.
He said the party was meeting to discuss its strategy, but added: “I believe that will be the stance we will have later on when we see the wording.”