Labour leader Jeremy Corbyn has told MPs he will table a motion of no confidence in Prime Minister Theresa May over her handling of the Brexit deal vote.
He said: "It's very clear that it's bad, unacceptable that we should be waiting almost a month before we have a meaningful vote on the crucial issue facing the future of this country.
"The Prime Minister has obdurately refused to ensure a vote took place on the date she agreed, she refuses to allow a vote to take place this week and is now, I assume, thinking the vote will be on January 14 - almost a month away.
"This is unacceptable in any way whatsoever.
"So, as the only way I can think of ensuring a vote takes place this week, I'm about to table a motion which says the following: 'That this House has no confidence in the Prime Minister due to her failure to allow the House of Commons to have a meaningful vote straight away on the Withdrawal Agreement and framework for future relationships between the UK and European Union.'
"That will be tabled immediately, Mr Speaker."
Corbyn accused Theresa May of leading Britain into a "national crisis" over Brexit, as he warned her deal has lost Cabinet support.
He said: "We face an unprecedented situation - the Prime Minister has led us into a national crisis.
"If any more evidence was needed of why we face this grave situation, the Prime Minister demonstrated it at last week's summit.
"There were some warm words drafted and the Prime Minister even managed to negotiate those away to be replaced by words about preparing for no deal."
'14 weeks until the UK'
The Prime Minister announced on Monday that the meaningful vote on her Brexit deal will be held in the third week of January, the Prime Minister has told the House of Commons.
Mrs May said: "It is now only just over 14 weeks until the UK leaves the EU and I know many members of this House are concerned that we need to take a decision soon.
"My right honourable friend the Leader of the House will set out business on Thursday in the usual way, but I can confirm today that we intend to return to the meaningful vote debate in the week commencing January 7 and hold the vote the following week.
"I know there are a range of very strongly-held personal views on this issue across the House and I respect all of them.
"But expressing our personal views is not what we are here to do. We asked the British people to take this decision."