The tariffs were put in place in February, days after the Supreme Court struck down President Trump's previous round of sweeping "Liberation Day" tariffs.
The Justice Department argues the patchwork of state laws around guns makes it difficult to take them across state lines for lawful purposes like target shooting, hunting and self-defense.
Three U.S. Navy destroyers transiting the Strait of Hormuz came under attack on Thursday, and the U.S. struck on two Iranian ports abutting the strait, putting into question an increasingly fragile U.S.-Iran ceasefire.
