The UK could pursue alternative options if Theresa May's Brexit plan is rejected by MPs, Work and Pensions Secretary Amber Rudd has acknowledged, BBC reports.
She is the first cabinet minister to publicly float the possibility of "plausible" alternatives.
Mrs Rudd told BBC Radio 4's Today programme she still supported the PM's plan - but "anything could happen" if it did not get through on Tuesday.
She said it could be "chaotic" if Mrs May's deal is rejected.
Mrs Rudd said a so-called "Norway plus" option or another referendum would both be possibilities in such a situation.
A Norway plus arrangement would see the UK remaining in the European Economic Area (EEA) and joining a customs union with the EU.