Trade wars with allies could spiral as the president tries to get trading partners to back down from retaliation with new threats of his own.

His administration has acknowledged that exceptions undercut the power of tariffs, but it seems hard for the president to resist making deals.

Goods trading under the rules of the North American trade pact, or the vast majority of products, would be exempt from tariffs, the president said....

President Trump’s stiff tariffs on Mexico and Canada could push those allies into recession. The impact for America could be messy.

The president initiated an investigation that could lead to tariffs on lumber imports, nearly half of which comes from Canada.

The administration is positioning itself to clamp down on Chinese investment and access to technology. But the wild card may be the president himself.

U.S. officials are considering whether they can strike a deal with China that would ramp up its purchases of American goods and investments in the...

With less than a month in office, the president has pursued trade actions that could shatter the global trading system and dwarf the trade measures...

The president said advisers would devise new tariff levels reflecting countries’ tariffs, taxes, subsidies and other policies affecting trade with the United States.

The president said advisers would devise new tariff levels reflecting countries’ tariffs, taxes, subsidies and other policies affecting trade with the United States.