"Some will try to keep their leadership hopes alive by claiming it was not the time to quit and they had a duty to stay on to ensure Brexit is not further watered down".
Leading Brexiteer David Jones, a former minister at Mr Davis's Department for Exiting the EU, said the proposed deal breached all three of Mrs May's red lines of leaving the single market, customs union and jurisdiction of the ECJ.
The Prime Minister will address Tory MPs on Monday and her chief of staff Gavin Barwell has been engaged in efforts to explain the Chequers deal to concerned colleagues alongside Chief Whip Julian Smith.
May's government recently hammered out a plan for negotiations with the E.U. But the plan caught flak from some hardline Brexit supporters who anxious it wouldn't do enough to fully separate the United Kingdom from the E.U.
Loud applause could be heard at the end of the 1922 Committee meeting, which the PM attended for just over an hour.
"Essentially it seems like May won, with some minor throwaway lines to placate the Brexiters", said Sam Lowe, a senior researcher fellow at the Centre for European Reform. Such a proposal would nearly certainly be rejected by the EU.
"Brexit should be about opportunity and hope", Johnson said in a resignation letter.
They also agreed that parliament would have the power to decide whether to follow European Union rules and regulations in the future, and the government would step up preparations for the eventuality of a "no deal" exit.
Britain would therefore have the right to control its own tariffs and strike trade deals with non-EU nations, the government says.
'Critically 80% of our economy will be outside the European Union orbit but his deal also delivers for the part of the economy which has integrated supply chains with Europe'.
Why did David Davis resign?"Ideally the UK's proposals will facilitate both the UK's internal political debate and the negotiation with us".
"We can be more optimistic than we were a week ago", Irish Prime Minister Leo Varadkar told a news conference after meeting his Austrian counterpart in Dublin.
"And one of the things about this compromise is that it unites the cabinet".
May visited German Chancellor Angela Merkel on Thursday and reportedly showed her a draft of the proposal.
Under the proposals, yet to be presented to the European Union, there would be a free trade area for industrial and agricultural goods, based on a "common rule book" and a "combined customs territory".
She paid tribute to Mr Johnson's "passion" in championing a global Britain after Brexit and Mr Davis' work in steering through key Brexit legislation.
She will tell MPs it was "the Brexit that is in our national interest" and "will deliver on the democratic decision of the British people".
There were also signs that Brussels was less than impressed after an initial examination of the plans, which were thrashed out and agreed by the entire cabinet at an all-day summit at Chequers on Friday.
Ireland is important because May has promised to avoid border checks between that country and British Northern Ireland, to protect the peace process.
The UK Parliament would "take back control" by having the power to align UK goods rules with Brussels - or to diverge from them.
The free movement of people was ending, he said, and the UK Parliament would have the final say over rules governing a "huge swathe" of the British economy.
Although current "passporting" rights, which allow British financial firms to operate freely in the European Union, would cease, the government says arrangements "that preserve the mutual benefits of integrated markets and protect financial stability" will be put in place.
She said there was a "willingness to sit down and talk" about the plans.
What has been the reaction from the EU?
"In the Brexit negotiations, there are still too many questions and too few answers", Barnier said, adding time was running out to reach a deal on these matters.
Mr Johnson, who has long harboured ambitions to lead the Conservative party and was the de facto leader of the Leave campaign, warned in his resignation letter that Mrs May's Brexit plan meant Britain was "truly headed for the status of colony".
Then she will nearly certainly face a backlash from Brexit true believers inside her Tory party in parliament, with Jacob Rees-Mogg's European Research Group likely to raise grave concerns over the proposals when May meets colleagues on Monday.
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