US President Donald Trump on Friday threatened to impose a 100% tariff on European countries that impose a digital services tax on US tech companies.

In a social media post, Trump wrote that numerous European countries have been discussing the imminent implementation of a Digital Services Tax on American companies and some of these countries "are close to actually doing this."

He said if these taxes are to proceed, the US retaliatory tariff will be immediately imposed. 

Digital service taxes typically apply only to the world's largest and most established tech companies, like Meta, Alphabet and Amazon, all of which are US firms. More than a dozen countries have imposed digital services taxes, according to local media outlets in Europe on Friday.

Trump earlier has vowed to retaliate against countries that impose digital services taxes, claiming they unfairly target US tech giants.

In February, the Supreme Court struck down Trump's "reciprocal tariffs" that aimed to impose individualized tariff rates on almost all countries in the world under the International Emergency Economic Powers Act. Hours after the ruling, Trump signed an executive order imposing a new global 10% tariff under Section 122 of the Trade Act of 1974. But tariffs under this section can last for only 150 days.

(With input from Xinhua)