Theresa May has called off Tuesday’s crucial vote on her Brexit deal in the face of what was expected to be a significant defeat by Tory rebels.
The prime minister is setting out her reasons for the delay in a statement to MPs.
Downing Street had been insisting the vote would go ahead.
The pound fell sharply in response, shedding 0.5% versus the US dollar to stand at $1.26, an 18-month low. The pound was 0.8% down against the euro.
Mrs May’s Commons statement will be followed by a statement from Commons leader Andrea Leadsom – and then a statement from the Brexit secretary Stephen Barclay on Article 50 – the legal mechanism taking the UK out of the EU on 29 March.