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Britain's Prime Minister Theresa May gives a statement to the House of Commons in London on Nov. 26, 2018, to update parliament on the newly agreed Brexit deal.JESSICA TAYLOR/AFP/Getty Images

British Prime Minister Theresa May made a blunt appeal to skeptical lawmakers on Monday to back her divorce deal with the European Union: It isn’t perfect, but it’s all there is, and the alternative is a leap into the unknown.

In essence, she urged Parliament: Let’s agree and move on, for the sake of the voters.

Britain and the leaders of the other 27 other members of the bloc signed off on a Brexit deal on Sunday after more than a year and a half of tough negotiations. It was a day many doubted would ever come, but Ms. May was anything but triumphant as she reported back to Parliament, which now controls the fate of the deal. Ms. May confirmed that British lawmakers will vote on Dec. 11, after several days of debate, on whether to approve the agreement.

Scores of legislators – from both the opposition and Ms. May’s governing Conservative Party – have vowed to oppose it. Rejection would plunge Britain into a political crisis and potential financial turmoil just weeks before it is due to leave the EU on March 29.

“No one knows what would happen if this deal didn’t pass,” Ms. May told the House of Commons.

“Our duty as a Parliament over these coming weeks is to examine this deal in detail, to debate it respectfully, to listen to our constituents and decide what is in our national interest.”

Before then, Ms. May plans a frantic two-week cross-country campaign to convince both the public and lawmakers that the deal delivers on voters’ decision in 2016 to leave the EU “while providing a close economic and security relationship with our nearest neighbours.”

But Ms. May’s defence of her hard-won deal in Parliament was followed by a torrent of criticism, from hard-core Brexit-backers, pro-EU lawmakers and previously loyal backbenchers alike.

In another potential blow for Ms. May, U.S. President Donald Trump said her agreement “sounds like a great deal for the EU” that would make it more difficult for the United Kingdom to strike a trade deal with the United States. Brexiters see a wide-ranging trade deal with the United States as one of Britain’s main goals after leaving the EU.

Mr. Trump said that “right now if you look at the deal, they may not be able to trade with us, and that wouldn’t be a good thing.”

“I don’t think that the Prime Minister meant that and hopefully she’ll be able to do something about that,” Mr. Trump said outside the White House. “But right now, as the deal stands, she may not, they may not be able to trade with the U.S., and I don’t think they want that at all.”

In response to Mr. Trump’s comments, Ms. May’s 10 Downing St. office said that under the deal agreed upon with the EU, “we will have an independent trade policy so that the U.K. can sign trade deals with countries around the world – including with the U.S.”

But during Monday’s debate in Parliament, legislators again expressed their deep unease, if not hatred, of the deal that keeps Britain outside the EU with no say, but still subject to the rules and the obligations of membership at least until the end of 2020 while a permanent new relationship is worked out.

Labour Party Leader Jeremy Corbyn said the “botched deal” would leave Britain worse off, with “no say over EU rules and no certainty for the future.”

“Plowing on is not stoic. It’s an act of national self-harm,” he said.

Ms. May argued that the British people are sick of endless debates about Brexit, and backing the deal would allow “us to come together again as a country, whichever way we voted.”

“The majority of the British public want us to get on with doing what they asked us to,” she said.

The majority of lawmakers appear unconvinced. Dozens of Conservative legislators say they will reject the deal, either because they want a harder or a softer break with the EU. Northern Ireland’s Democratic Unionist Party, which props up Ms. May’s minority government, also opposes it, as do all the main opposition parties.

“The Prime Minister and the whole House knows the mathematics – this will never get through,” said Brexit-backing Conservative Mark Francois, who described the deal “a surrender” to the EU.

Brexit Secretary Stephen Barclay conceded that “it’s going to be a challenging vote.” But he said Britain would be in “choppy waters” if the deal was rejected.

Both Britain and the EU are adamant that the U.K. can’t renegotiate the agreement, and opponents of the deal do not agree on what should happen next if Parliament rejects it. Some want an election, others a new referendum and some say Britain should leave the bloc without a deal.

“I can say to the House with absolute certainty that there is not a better deal available,” Ms. May said.

She said rejecting it “would open the door to more division and more uncertainty, with all the risks that will entail.”

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