'Tory rebels were today warned they risk 'plunging a knife into the heart' of Theresa May's premiership by voting to stay in a customs union with the EU.
Iain Duncan Smith raised the prospect of the Prime Minister being forced out and replaced by Jeremy Corbyn if she is defeated on the key issue.
Mrs May is facing immense pressure from both Remainers and Brexiteers to find a way through the bitter standoff on trade with the EU.
Eurosceptics appear to have all-but killed off her compromise solution of a 'customs partnership' with the EU, branding it unworkable. Environment Secretary Michael Gove said this morning that the idea was 'flawed'.
But the alternative of a 'Maximum Facilitation' arrangement - relying on technology and trusted trader schemes to minimise trade friction - is regarded as unacceptable by many Remainers. They warn it would hurt business and mean a hard Irish border.
Around a dozen Conservative MPs have signalled they could join with Labour to back membership of a customs union with Brussels after Brexit. That would almost certainly be enough to overturn the PM's slender majority.
Speaking on the BBC's Sunday Politics, Mr Duncan Smith warned that Mrs May's leadership might not survive defeat in the Commons on the issue.'
Read more: Tory rebels will 'plunge a knife into the heart' of Theresa May's premiership by voting to stay in EU customs union, warns Iain Duncan Smith
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