Six supply chain analysts The New York Times interviewed on Thursday said they were uncertain how the administration might go about imposing and enforcing the tariffs. One route, they suggested, could be to base the tariffs on whether the maker of a finished device, for example an Apple iPhone or an Nvidia A.I. server, had facilities in the United States.

Another way would be to inspect a device’s components to determine whether the maker of its logic chips, like TSMC, or its memory chips, like Samsung, made anything in the United States.