WASHINGTON, D.C. — Many Canadian exporters are facing the threat of 50% duties on their goods under Section 338 tariffs. …These firms may also need to increase their customs-bond coverage, which guarantees payment of duties and fees if an importer defaults, as higher tariffs increase the US government’s exposure. But trade lawyers and customs professionals say another change could affect far more Canadian exporters… an executive order that seeks to tighten US customs enforcement to crack down on trade fraud and shell importers that evade duties. “They’re going to a stricter importer regime … directing US authorities to strengthen the importer registration, bonding, disclosure, vetting, and enforcement,” said Martha Goncalves, at PwC Canada. …“The US trying to change the global trading system, and this is just part of their playbook,” she said. “Unfortunately, we get hit hardest because we have such a big footprint of Canadian exports going to the US”