Canada has not included the United States in an coming meeting aimed at saving the international trading system because it doesn’t share the views of the 13 invited countries, the new Canadian trade minister says.

Canada will play host to senior ministers from 13 “like-minded” countries for a two-day discussion in Ottawa later this month to brainstorm ways to reform the World Trade Organization, said Jim Carr, Canada’s newly appointed International Trade Diversification Minister.

Mr. Carr said the group of countries he’s convened ultimately wants to persuade Washington of the continued usefulness of the WTO, but for now the best way forward is without the United States in the room.

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“We think that the best way to sequence the discussion is to start with like-minded people, and that’s whom we have invited and they’re coming,” Mr. Carr said.

“Those who believe that a rules-based system is in the interests of the international community will meet to come up with a consensus that we will then move out into nations who might have been more resistant.”

Asked what his message to Americans is in the meantime, Mr. Carr replied: “That a rules-based system is good for them, too.”

The WTO is one of a long list of international organizations and agreements derided by U.S. President Donald Trump and his protectionist administration. Mr. Trump’s top economic adviser, Larry Kudlow, has at times branded the WTO as ineffective and simply “broken."

In the case of the WTO, the United States has moved beyond hostile rhetoric and blocked the appointments of new judges to its dispute-settlement body, which is threatening to paralyze the organization and prevent it from making decisions.

“The impasse of the appointment of the appellate body members threatens to bring the whole dispute settlement system to a halt,” says an eight-page Canadian discussion paper that has been circulated among the 13 invited countries.

The Canadian Press obtained a copy of the paper, which has not been publicly released.

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Mr. Carr said Canada is keeping an open mind on finding new ways to settle international trade disputes.

“But the main point is, we believe the WTO, reformed and refreshed, is the best way to re-establish a rules-based system.”

Mr. Carr said efforts to persuade the Americans to see that point would have been “a lot harder” if Canada hadn’t preserved dispute-resolutions mechanisms in the newly renegotiated continental free-trade pact, renamed the United States-Mexico-Canada Agreement.

“You want your major trading partners to admit that you need a dispute-settlement mechanism.”

Prime Minister Justin Trudeau told an Edmonton radio station last month that independent dispute-resolution mechanisms, which the United States wanted to scrap, needed to be preserved because Mr. Trump “doesn’t always follow the rules as they’re laid out.”

Canada is inviting Australia, Brazil, Chile, the European Union, Japan, Kenya, South Korea, Mexico, New Zealand, Norway, Singapore and Switzerland to two days of talks on the WTO starting Oct. 24 in Ottawa.

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The Canadian discussion paper lays out three broad themes for the discussion: safeguarding and strengthening the dispute-settlement system; improving the efficiency and effectiveness of the WTO monitoring function; and modernizing trade rules for the 21st century.

On the latter point, the paper acknowledges that “aging trade rules need to be updated urgently to respond to the needs of the modern global economy,” but notes “there is a divergence about the priorities.”

The paper doesn’t single out the United States by name, but it makes clear that international trading institutions are “increasingly fragile.”

“The challenges facing the multilateral trading system cannot be attributed to any single cause or any single country,” the document says.

“However, the combination of disruption and paralysis has begun to erode respect for rules-based trade, and the institutions that govern it, paving the way for trade-distorting policies.”