The US Court of International Trade scrutinized the legal foundation for President Donald Trump’s latest Section 301 tariffs, questioning whether US Trade Representative Jamieson Greer had sufficient authority and evidence to impose forced-labor-related duties on 60 economies spanning 86 countries. The tariffs, announced in July, impose rates of 10% or 12.5% and affect trading partners accounting for 99.4% of US imports. Small businesses and Democratic state officials argue the levies improperly revive broad global tariffs the Supreme Court struck down under a separate emergency-powers law earlier this year. Justice Department lawyer Eric Hamilton defended Greer’s discretion and the administration’s use of case studies, while challengers said the record lacked concrete, country-specific findings. The three-judge panel gave no indication of when it will rule in the Learning Resources test case.