Of the 28 total seizures, 23 were genetically assigned to a different main country of origin than the country from which they were being shipped. (sciencedaily.com)
Per U.S. government statistics for that period, the main countries filling the gap between demand and production are Canada, Brazil, South Korea, Mexico, and Russia. (fortune.com)
And those are the main countries that would be hit by tariffs or quotas. (vox.com)