US President Donald Trump on Friday threatened to impose a 100% tariff on all goods imported into the United States from any country that introduces a digital services tax (DST) targeting American companies, warning that the measure would override any existing or future trade agreement with that country.In a post on Truth Social, Trump said countries moving ahead with such taxes would face immediate trade retaliation from the United States."Any Country that imposes such a Tax will immediately be met with a 100% TARIFF on any and all Goods sent to the United States of America," Trump wrote.The US president further declared that the tariff "will supersede Trade Deals made with the Country, whether implemented, signed, or not," indicating that existing agreements would not shield countries from the proposed penalties.Trump's warning appeared to be aimed primarily at several European nations, which he said were discussing the imminent implementation of digital services taxes on American technology companies."Numerous European Countries have been discussing the imminent implementation of a Digital Services Tax on American Companies. Some of these Countries are close to actually doing this," he said.He added that the tariffs would take effect immediately if those countries proceeded with the tax."Additionally, the 100% TARIFF will be immediately imposed, if they proceed," Trump said.Digital services taxes are levies imposed by some governments on revenues earned by large technology companies from online services such as digital advertising, marketplaces and user data. The taxes have long been opposed by Washington, which argues they disproportionately target US-based technology giants.