But she accepted that delivering Brexit involved hard choices all around.
The SMMT has previously blamed Brexit uncertainty for plunging United Kingdom investment by largely foreign-owned carmakers. Many fear it will divide the West as it grapples with both the unconventional USA presidency of Donald Trump and growing assertiveness from Russian Federation and China.
"This is not the deal the country was promised, And Parliament can not and I believe will not accept a false choice between this bad deal and no deal", he said.
European Union leaders will meet on November 25 to endorse May's divorce deal, although the British prime minister acknowledged that a number of obstacles remained before Brexit could be finalised.
Forty-eight are needed to instigate a vote. It is unclear whether she has the numbers.
But she conceded there were "difficult days ahead" as she seeks to woo MPs.
And leading backbench Brexiteer Jacob Rees-Mogg submitted a letter of no confidence in Mrs May to Sir Graham Brady, chairman of the Tories' backbench 1922 Committee. There was no confirmation.
"With respect, prime minister, this agreement does not provide for the United Kingdom being a sovereign, independent country leaving the shackles of the European Union, however it is worded", he wrote.
Both members from May's Tory party and opposition Labour told her that her draft deal is disastrous and would not pass the United Kingdom parliament, which is expected to vote on the deal sometime in December.
Few would argue she's had an easy time.
"The choice is clear: we can choose to leave with no deal, we can risk no Brexit at all or we can choose to unite and support the best deal that can be negotiated", she told the Commons.
Many opponents of Brexit are also upset as they fear Britain will be subject to the EU's rules while getting none of the benefits of membership. The members of the ERG are bound to vote against the Bill, as will several pro-remain MPs who want a new referendum.
Country Music Hall of Fame singer Roy Clark has died at 85
He recorded hits like "The Tips Of My Fingers", "If I Had It To Do All Over Again" and "Thank God And Greyhound You're Gone". Roy Clark , country music legend and host of the nationally televised variety show Hee Haw , has died at the age of 85.
But Labour leader Jeremy Corbyn called on her to "withdraw this half-baked deal".
They said: "The UK Government's handling of the deal reached is symptomatic of the chaotic approach to the negotiations and the lack of any meaningful engagement with the devolved administrations".
"This is not the deal the country was promised", he said. Its leader, Arlene Foster, was due to meet with May late Wednesday.
The hard issue in the talks was the Northern Irish "backstop", an insurance policy to avoid a return to controls between the British province and EU-member Ireland which could threaten the 1998 peace accord which ended 30 years of violence.
"I am sorry they chose to leave the government and I thank them for their service", she said.
If they approve the agreement, the British parliament is scheduled to vote on it in early December.
Paying tribute to both his negotiating team and their UK counterparts, he said much work still had to be done but insisted: 'The UK will remain our friend, our partner, our ally'.
A no-deal would see existing regulations vanish, and with no more free trade with the European Union, goods flowing in and out of Britain would need to be tracked.
The EU's chief Brexit negotiator, Michel Barnier.
"I believe with every fiber of my being that the course I have set out is the right one for our country and all our people", she said.
"The challenge for all of us in this House is to make choices not according to what we wish the world would be like, but the reality of the world that we see", she said. This is a decision which will come under intense scrutiny and that is entirely as it should be and entirely understandable. They have also agreed to the text of a separate, shorter statement on the UK's future relationship with the European Union, including the kind of trade deal the two sides want.
The government is falling apart before our eyes as for a second time the Brexit secretary has refused to back the prime minister's Brexit plan.
If I may end by just saying this.
He added that "if I weren't confident that you did your best to protect the interest of the 27, and I familiar of the essence of the document, I would not propose to formalise this deal" at the summit later this month.