Here is the thing most people got backwards this month.
They read the G20 headline — 19 countries backing Washington against China, only Beijing dissenting — as the moment the US finally built its coalition. It was actually the moment the US started dismantling it.
Because, reportedly, the same administration that won that 19-1 vote spent the same week firing tariffs at Canada, one of the nineteen.
You cannot ask a country to align its China policy while you are taxing its exports. That contradiction — a diplomatic win and a strategic self-inflicted wound arriving on the same calendar — is the whole story.
A diplomatic win and a strategic self-inflicted wound arriving on the same calendar — that contradiction is the whole story.
Last week we argued the tariff wall was rhetoric that backfired, driving Chinese goods into allied markets and handing Beijing the diversion. This week the argument moves from rhetoric to law: the courts have now vacated the authority the wall was built on, and the US-Canada trade war is the concrete fracture that makes the backfire real.
Start with the legal collapse, because it explains why everything downstream is discretion rather than policy.
On February 20, 2026, the Supreme Court ruled 6-3 in Learning Resources, Inc. v. Trump that the administration had exceeded its authority under the International Emergency Economic Powers Act. Chief Justice John Roberts wrote the line that now hangs over the entire regime: "the power to regulate is not the power to tax."
The ruling voided emergency tariffs on Canada, Mexico, China, and others, and triggered roughly $170 billion in refund claims.
Within hours, the White House pivoted. It reimposed a 10% across-the-board tariff under Section 122 of the Trade Act of 1974 — the balance-of-payments provision — effective February 24, good for up to 150 days.
That pivot is the tell. A regime with a real legal foundation does not swap statutes before lunch. It reached for the next available lever because the first one had just been sawn off.
The second lever broke too. On May 7, 2026, the Court of International Trade ruled 2-1 that the Section 122 tariffs were unlawful, because the administration never demonstrated the "large and serious balance of payments deficits" the statute requires. It had used Section 122 as a substitute for IEEPA, and the court saw through it.
The injunction technically named only the plaintiffs. But it cast a shadow over every importer in the country.
Now count the wreckage. Roughly $25 billion in Section 122 duties already collected, sitting in legal limbo. Another $170 billion in IEEPA refund claims from the first ruling. A 150-day window set to expire in July with no clear successor authority.
This is what a machine tearing off its own limbs looks like. Two statutes, six weeks, both gone.
Here is why the legal void matters more than any single tariff rate.
Before February, the tariff regime at least ran on statutory claims — contestable ones, but claims. After May, it ran on presidential mood. There was no legal floor left. Tariffs became pure discretion.
And discretion is precisely the thing allies cannot underwrite.
A firm can plan around a rules-based tariff, even a punishing one. It cannot plan around a policy that appears or vanishes depending on who is in the room. A Georgetown trade-law professor reportedly put it plainly: companies are now pricing in the risk of sudden tariff reversals, which permanently raises the cost of cross-border sourcing.
The evidence is already in the sourcing data. A mid-2026 logistics survey found 65% of firms have altered sourcing patterns, up from 38% a year earlier. Just-in-case inventory is now a board-level priority, not a theory.
So the US arrived at the Asheville G20 with a regime that had no legal authority and no predictability — and asked nineteen countries to trust it anyway.
They did, on paper. The chair's statement, endorsed by everyone but China, agreed that countries with "excessive and persistent external surpluses should remove distortions" that force over-reliance on exports.
Scott Bessent claimed vindication. He had warned partners that the US tariff wall would divert Chinese goods into their markets, and, in his words, "unfortunately, I was right." His boast on the coalition: "the fact that 19 countries did want to address this shows the sheer the enormity of the problem."
He is not wrong about the problem. China's trade surplus reportedly hit a record $1.2 trillion in 2025, per Bessent. The diversion he warned about reportedly shows up in Vietnam's fifth straight quarter of double-digit export growth and Mexico's record 16.8% share of US imports.
But a coalition against China is only worth anything if the members actually align — restrict the same goods, close the same loopholes, tolerate the same friction. That is the whole point of a coalition. It converts nineteen separate markets into one wall China cannot route around.
The Peterson Institute's Chad Bown has been making this case in structural terms. The more the US works to reduce its vulnerability to Chinese coercion, he argues, the more it needs Canada and Mexico to align their own policies — and the harder it will have to work to invite them along. China's dominance demands all three North American countries move together.
Now put the two facts side by side. Nineteen countries endorse the US position at Asheville. Reportedly that same week, the US hits one of them — Canada — with tariffs.
Canada reportedly responded with a "calibrated," rules-based response aimed at defending its manufacturing and energy base while trying not to sever the integrated North American market.
That is the mechanism by which coalitions die. Not a dramatic betrayal — just an incentive that makes alignment irrational.
Ottawa cannot spend political capital tightening its China policy to help a partner that is simultaneously taxing its exports. Every dollar Canada moves to align with Washington on China is a dollar spent helping a country currently attacking its export sector. The math does not close.
Which brings the whole thing to Bown's verdict, the one that reframes the 19-1 headline entirely: "Xi Jinping will probably be the only winner in Trump's trade war with Canada."
Not because China won an argument. Beijing was the lone dissenter and lost the vote 19-1. It won because the US kept demolishing its own scaffolding — first the legal authority the tariffs stood on, then the diplomatic unity that would have made anti-China policy actually bite.
The physical proof is already booked. GM is reportedly planning a C$1.1 billion investment in Canada as US tariff pressure mounts, per VCP Trading.
Sit with that number. This may reportedly reflect reshoring — capital physically relocating in response to tariffs — flowing into Canada rather than the United States. The tariffs meant to pull production home may be pushing a marquee American automaker's money across the northern border instead.
That is Bown's paradox made concrete. The reshoring is real; the direction is wrong. Sixty-five percent of firms are reshuffling supply chains, and the destinations are Vietnam, Mexico, the Mediterranean hubs — and, for GM, Canada. Everywhere except where the policy intended.
The clean version of this month reads as a US victory: 19-1, a chastened Beijing, allies falling into line. The mechanism underneath reads the opposite.
Washington won the vote and lost the coalition in the same week, because a regime with no legal floor cannot credibly ask anyone to build on it — and then it taxed the ally it most needed to keep.
China did not have to win the argument. It only had to wait while the US knocked out its own supports, one statute and one ally at a time.