Mr Bercow, who Tory Brexiteers have accused of being pro-Remain, will rule on whether the Government can bring a so-called "meaningful vote" on its plans.
If the Speaker blocks the move, focus will switch to the Government bringing its Withdrawal Agreement Bill (WAB) before MPs on Monday, with a vote on its second reading on Tuesday.
Ministers insist they "have the numbers" to push the agreement through, but the parliamentary situation appears to be on a tightrope.
Julia Hartley-Brewer spoke with People's Vote campaigner Alastair Campbell.
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