The government’s withdrawal deal has been defeated by a majority of 230, and some MPs backing the “People’s Vote” campaign will hope the alternative that emerges is a second referendum, as MPs fear a no-deal Brexit and go for another vote as a last resort.
But there is currently no majority for a second referendum in parliament, and as MPs haven’t yet come up with an alternative to a no-deal Brexit or Theresa May’s deal that could win a majority in the Commons, it’s unlikely a majority will suddenly appear for a second referendum.
Labour has put down a no-confidence motion in the government after its deal was defeated, which will happen on Wednesday at 7pm. If Labour then loses (which it most likely would, without the DUP onside), then it will be under pressure to campaign for a second referendum – as its official policy is to consider this option among others should it fail to force a general election. If the Labour frontbench officially campaigned for a second referendum, it would boost the chances of one – but Jeremy Corbyn has shown so far that he’s reluctant to back the idea, and anyway it’s unlikely he could whip for it, considering the small number of Labour MPs who are on board.
A second referendum would be very difficult to get through parliament. I explain the legislative process here. Political reality means it’s unlikely there will be a majority required to pass the legislation, or extend Article 50 to make time for the process (the UCL’s Constitution Unit estimates it would take 22 weeks from beginning legislation to polling day).