Chris Grayling said putting a stop to Britain's withdrawal from the European Union may end centuries of "moderate" politics the United Kingdom has enjoyed since the English Civil War as he urged his Conservative colleagues to back Theresa May's Brexit deal.
MPs are due to vote on her withdrawal agreement on Tuesday night, but it is widely anticipated that it will be defeated, with backbench Brexiteers and the DUP vehemently opposed to both the Northern Irish backstop clause and the £39bn divorce bill.
Blocking Brexit could put an end to the centuries of "moderate" United Kingdom politics and "open the door" to extremists, a Cabinet minister has warned.
Foreign secretary Jeremy Hunt has warned voting down Theresa May's Brexit deal would lead to "paralysis" in parliament that ushers in either a no-deal or remain scenario.
"If MPs who represent seats that voted 70% to leave say "sorry guys, we're still going to have freedom of movement", they will turn against the political mainstream".
"Some of you put your trust in the political process for the first time in decades". As the protectors of our democracy, we simply can not allow this to happen.
"Doing so would be a catastrophic and unforgivable breach of trust in our democracy".
"So my message to parliament this weekend is simple: it is time to forget the games and do what is right for our country", she wrote.
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Mrs May's warning came as Downing Street was reported to be concerned about efforts by a cross-party group of MPs to change Commons rules to enable backbench motions to take precedence over government business if Mrs May's deal falls.
BBC political correspondent Chris Mason said one possibility was that backbenchers could legally compel the government to delay Brexit beyond the set departure date - a proposal some MPs have already called for.
Defeat will leave Britain staring at an exit on March 29 without a deal, unless the country's feuding politicians can agree on another plan. Barry Gardiner, the shadow trade minister, said last week that a vote of no confidence would "obviously" have to follow immediately after a defeat for May's deal.
The Cabinet ministers were speaking as MPs prepared for the third day of debate in the House of Commons ahead of next Tuesday's crunch vote, with Home Secretary Sajid Javid opening proceedings which are expected to be dominated by the issue of migration.
MPs are widely expected to reject the deal, negotiated between the European Union and United Kingdom, with more than 100 Conservative MPs among those opposing it.
While in the second they voted for the government to come back to the Commons with a plan B for Brexit within three days should it lose Tuesday's vote.
Yet should Corbyn fail to force an election, it will place the Labour leader under greater pressure from many of his own MPs, as well as party members and supporters, to throw his weight behind a second referendum as the way to break the Brexit impasse.