The Conservative MP for North East Somerset and chairman of the European Research Group has insisted the Prime Minister must stick to her original mantra that “no deal is better than a bad one”.
He also blamed the elite and the European Union for trying to undermine her efforts in negotiations.
Writing in a newspaper column, Mr Rees-Mogg said: “The Prime Minister commands the support of Brexit backing Members of Parliament, Conservative party members and Brexiteers in the nation at large. This is why her opinion poll ratings remain so high.
“Yet the metropolitan establishment of fashionable society and the beau monde is still against her.
“Theresa May must stand firm for what she herself has promised.”
Writing in the Telegraph he likened a betrayal of her manifesto pledges to take the UK out of the single market and customs union to Conservative Prime Minister Sir Robert Peel and his decision to break his manifesto pledge.
He added: “This left the Conservatives out of majority office for twenty-eight years, 1846 to 1874. At least he did so for a policy that worked.”
The Brexiteer also dismissed the “fake alarum” surrounding the Northern Ireland border issue.
He argued the issue is being exploited by the EU and Ireland itself for political gain.
He continued: “We need to call the Irish bluff. There is no insurmountable problem concerning the Northern Ireland border and any solution which would split the UK in two is outrageous. That the EU suggested it is offensive.
“This fake alarum should be seen for what it is: domestic Irish politicking in advance of a general election with Dublin being gullibly exploited by Brussels.
“Ireland is being used by the EU to put pressure on us.
“Her Prime Minister supporting Belgium over England might get cheered in Irish pubs but it is not getting them anywhere in Brussels.”
Speaking ahead of an important Cabinet meeting on Friday, the MP for North East Somerset insisted it must maintain its negotiating line that no deal is better than a bad one.
He also dismisses claims the UK must accept a bad deal because a no deal scenario has not been prepared for.
Mr Rees-Mogg cited Brexit Secretary Davis Davis’s “titanium plated spine and his ministers in DExEU have ensured that preparations for a ‘no deal’ scenario are well advanced”.
He also said there is no legal reason to pay £39billion to the EU after Brexit without guarantee of a trade agreement.
Outlining what constitutes as a bad deal he said: “It must be judged against the UK’s economic interests but there are some things that no independent nation could agree to.
“Any attempt by the EU to impose its laws and Court on the UK, either directly or indirectly, must be rejected.
“Any EU agreement that restricts the country’s ability to make trade agreements with other states, restricts our ability to control our migration policy, makes us pay to trade or interferes with our fishing waters could not be accepted.”