Former U.S. President Donald Trump signed an executive order on Thursday imposing retaliatory tariffs ranging from 10% to 41% on imports from dozens of countries that lack bilateral trade agreements with the United States.

According to a senior White House official, the tariffs will come into effect on August 7—one week later than the originally scheduled date.

In a statement, the White House said that Syria tops the list of affected nations, facing the highest tariff rate at 41%. Other countries hit with steep tariffs include Laos (40%), Switzerland (39%), Serbia (35%), and South Africa (30%). The majority of countries will face additional duties of around 15%.

Trump posted details of the new trade measures on his Truth Social platform, listing 14 countries subject to the new levies, including Tunisia, South Korea, Malaysia, Kazakhstan, Japan, South Africa, Bosnia and Herzegovina, Indonesia, Serbia, Bangladesh, Thailand, Cambodia, Myanmar, and Laos.

The decision has sparked widespread concern among exporting businesses, with industry groups warning that the new tariffs could disrupt trade flows and raise costs for consumers and companies alike.