The tax provides more than $23 billion per year in revenue for federal highway and public transit programs. The federal gas tax has been in place, in one way or another, since 1919 and was last raised in 1993.
Trump previously said he was implementing the new baseline duty under Section 122 of the Trade Act of 1974, which grants the president unilateral ability to impose tariffs. But the untested legal provision puts a 150-day limit on how long the duties can remain in place. Congress would need to approve any extension. The Supreme Court, in a 6-3 decision handed down earlier Friday, ruled that Trump's use of a decades-old federal emergency-powers law to impose his so-called "reciprocal" tariffs was unlawful.
