President Donald Trump said today he would impose a 100% tariff on all films produced overseas that are then sent into the U.S., repeating a threat made in May that would upend Hollywood’s global business model. However, it was not immediately clear what legal authority Trump would use to impose a 100% tariff on foreign-made films. The president had first floated the idea of a movie tariff in May but offered few details, leaving entertainment executives unsure whether it would apply to specific countries or all imports. Studio executives told Reuters earlier this year that they were “flummoxed” by how a movie tariff might be enforced, given that modern films often use production, financing, post-production and visual effects spread across multiple countries. Hollywood has increasingly relied on overseas production hubs such as Canada, the UK and Australia, where tax incentives have attracted big-budget shoots for films ranging from superhero blockbusters to streaming dramas.