The looming legal fight injects uncertainty into President Donald Trump's evolving tariffs plan, which has upended the global economy since April 2.

The president's plan - where countries face between 11% to more than 100% tariffs on goods brought into the US - was announced in April. But the majority of the tariffs were paused by Trump for 90 days in the wake of stock market volatility.

If the tariffs had taken effect as planned, the per-unit cost of a home might have increased by as much as $29,000. In a sector characterized by thin margins, that would have meant a lot of idle construction sites.