Trump’s New Tariff Strategy Is Different This Time — And Importers Are About to Feel It

March 2026

For the past seven years, tariffs had a clear target: China.

Factories moved.
Supply chains shifted.
Importers adopted the famous strategy: China +1.

Move assembly to Vietnam.
Keep sourcing components from China.
Ship the product to the U.S. under a new country of origin.

For a while, that worked.

Now Washington is changing the rules.

The new tariff strategy isn’t just about China anymore. It’s about the entire supply chain behind the product.

What’s Actually Changing

The first round of tariffs focused on raising duties on Chinese imports.

That was the easy part.

But companies adapted quickly.

Production shifted to:

• Vietnam
• Malaysia
• Thailand
• Cambodia
• Mexico

On paper, the supply chain moved.

In reality, much of it didn’t.

Chinese components still dominate many manufacturing sectors.
Chinese machinery still runs the factories.
Chinese managers and engineers often operate the production lines.

So regulators are shifting the strategy.

Instead of just imposing tariffs, they are focusing on enforcement.

The New Enforcement Tools

The U.S. government now has several ways to challenge supply chains.

The most important ones are:

Section 301 investigations
Used to impose tariffs when a country’s trade practices are considered unfair.

Forced labor enforcement (UFLPA)
Allows shipments to be detained unless the importer can prove the supply chain is clean.

Tariff circumvention investigations
Used when production is suspected to have moved on paper but not in reality.

These tools turn customs enforcement into a supply chain investigation.

And that investigation happens at the port.

Why Vietnam and Southeast Asia Are Now Under the Microscope

Vietnam became the biggest winner of the China+1 strategy.

Exports to the United States surged.

But regulators are asking a simple question:

Did the supply chain actually move — or just the final assembly?

Many supply chains now look like this:

Components produced in China.

Machines and tooling from China.

Engineering support from China.

Final assembly in Vietnam.

Then the product ships to the United States labeled Made in Vietnam.

Sometimes that is legitimate.

Sometimes it isn’t.

The key legal test is called substantial transformation.

If the manufacturing process does not create a real change in the product’s:

• name
• character
• or use

the country of origin may still be considered China.

And that means tariffs apply.

Where CBP Enters the Picture

This shift turns customs enforcement into a documentation investigation.

When CBP reviews a shipment, officers may request proof such as:

• factory verification
• bill of materials
• supplier declarations
• production capacity data
• payment records
• invoice reconciliation

If the documentation does not match the supply chain, the shipment can be detained.

Many companies only discover the problem when CBP sends a CF-28 Request for Information.

By that point, the clock is already running.

The Mistake Many Importers Are Making

Most importers assume compliance is handled by their broker.

But brokers only file entries based on the information they receive.

They don’t verify factories.

They don’t inspect production.

They don’t confirm where components actually come from.

So when CBP asks questions, importers often realize the documentation simply doesn’t exist.

That leads to:

• shipment detentions
• retroactive tariffs
• penalties
• long-term scrutiny from regulators.

Where This Shows Up in Your Supply Chain

At the factory:
Suppliers may not have documentation proving origin or production flow.

At the forwarder:
Shipping documents may not match supplier invoices or payment records.

At customs entry:
Declared country of origin may not match the actual manufacturing process.

At the warehouse:
Detained shipments disrupt inventory planning and lead to emergency logistics decisions.

What Importers Should Do Now

If tariffs are expanding beyond China, supply chain documentation becomes critical.

Importers should start by doing three things.

First, verify factories.

Know where production actually happens.

Second, map the bill of materials.

Understand where the inputs come from.

Third, create a compliance file before shipments move.

That file should include supplier declarations, production documentation, and origin analysis.

Companies that already have this documentation respond to CBP quickly.

Companies that don’t start searching for paperwork while the container sits at the port.

The Bottom Line

The new tariff strategy isn’t just about China anymore.

It’s about supply chain transparency.

Factories can move.

Assembly can move.

But if the documentation cannot prove the structure of the supply chain, tariffs and enforcement will follow.

The companies that prepare early will avoid disruption.

The companies that wait will be responding to CF-28 requests and detained shipments.

And by then, the clock will already be ticking.

FAQ

Q: Are tariffs now targeting countries other than China?
Yes. Investigations are expanding to countries that have benefited from the China+1 strategy, particularly where regulators suspect tariff circumvention.

Q: Does moving assembly to Vietnam eliminate China tariffs?
Not automatically. If the production process does not meet substantial transformation rules, the country of origin may still be considered China.

Q: How does CBP investigate supply chains?
CBP may request documentation such as factory verification reports, supplier declarations, production flow details, and invoice/payment reconciliation.

Q: What is the biggest risk for importers right now?
Assuming their broker handles compliance. Brokers file entries but do not verify supply chains.