Prime Minister Theresa May's Brexit plans face rejection by parliament's upper chamber on Monday, setting the stage for a confrontation with pro-EU rebel lawmakers later in the week which could rock her minority government.
The government source said on condition of anonymity that May would stick to her proposal to offer lawmakers a vote on a statement outlining the next steps if she fails to win agreement with the European Union, or if parliament rejects any deal she comes up with.
If MPs reject the agreement reached by Mrs May with Brussels, or if no deal has been obtained by January 21, Parliament will be offered the opportunity only to vote on a "neutral motion" stating that it has considered a minister's statement on the issue.
Ministers have so far agreed to give parliament a symbolic vote on the government's strategy if its initial exit deal is rejected, but not to give lawmakers the power to force changes.
May can not accept a competing proposal from Britain's upper house of parliament because it would undermine the government's ability to get the best possible deal with the European Union, he said.
A paper laying out the UK government position, due to be published this month, has been delayed because the Cabinet can not agree on a united stance.
Lord Hailsham said that Mr Grieve thought he had an agreement with the solicitor general last week, but it then appeared "senior ministers" had objected to it and it had now been "repudiated".
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"I want to ensure that parliament does have a meaningful vote and I don't want to see that left to chance", said Lord Hailsham, the member of May's Conservative Party who proposed the motion.
He told BBC Radio 4's The Westminster Hour: "I don't want to fetter my Prime Minister while she's negotiating the best deal for Britain".
Britain's house of lords has voted to allow lawmakers to decide on the fate of a final brexit deal.
Tory Lord True said the amendment would give the House of Commons "potential control over the Government in negotiations", adding: "I believe that to be utterly impractical and totally unconstitutional".
"We could collapse the government, and I assure you I wake up at 2:00 am in a cold sweat thinking about the problems that we have put on our shoulders", he said.
The Prime Minister stated she has listened to the concerns of the rebel Tory MPs, but noted future legislation can not hamper the Government's ability to negotiate the final Brexit solution.
Pro-European lawmakers in May's own party are planning to rebel against the government as they seek to prevent the no-deal Brexit scenario that businesses fear most.