President Donald Trump threatened to inflict “substantial” tariffs on countries that impose digital taxes just days after Meta Platforms Inc. Chief Executive Officer Mark Zuckerberg raised concerns about the levies during a White House meeting.

The Facebook co-founder visited Trump late last week, according to people familiar with the private meeting, who asked not to be named as the details aren’t public. During the meeting, one of the people said, Trump and Zuckerberg discussed the threat of digital service taxes, which are imposed on the revenue that tech companies get from users in a particular country. Meta generates the vast majority of its revenue through advertising targeted at Instagram, Facebook and WhatsApp users.

Days later, Trump said that digital taxes and related regulation harm and discriminate against American technology, while giving “a complete pass to China’s largest Tech Companies.” The president added that he was putting all countries with such taxes “on notice” and would impose “substantial” tariffs and export restrictions on U.S. semiconductors unless “these discriminatory actions are removed.”

“I will stand up to Countries that attack our incredible American Tech Companies,” Trump said Monday in a post on his social media platform, Truth Social.

The president’s comments reignited a long-running feud with U.S. trading partners, one that started long before last week’s meeting with Zuckerberg. U.S. officials have pressed the matter in trade talks with other nations and the European Union, arguing that digital taxes unfairly impact U.S. tech companies such as Meta, Amazon.com Inc. and Google owner Alphabet Inc.

“President Trump has repeatedly and consistently opposed digital services taxes and other unfair measures against American technology companies,” said White House spokesman Kush Desai. “The Administration has repeatedly and consistently raised these concerns in trade negotiations with other countries, including the EU.”

Nations with digital services taxes include France, Italy, Austria, Spain and the UK. Rates and thresholds vary among jurisdictions.

In a statement, Meta confirmed that the two men had met. “Mark Zuckerberg visited the White House last week to discuss Meta’s domestic infrastructure investments and advancing American tech leadership abroad,” the company said.

Since Trump’s return to power, Zuckerberg has sought to get in the good graces of the president, who once called the Meta CEO a “criminal” and threatened to throw him in jail. That effort has included an overhaul of the company’s moderation and diversity policies, as well as several visits to the White House and the president’s Mar-a-Lago resort in Florida, along with a $1 million contribution from Meta to Trump’s inauguration, which Zuckerberg attended.

Zuckerberg has also increased his presence in Washington, spending tens of millions of dollars on two adjacent homes near the Naval Observatory, where Vice President JD Vance resides, and bringing several Trump allies into his company and onto its board of directors.

With their relationship improved, Zuckerberg and Trump have repeatedly spoken about subjects ranging from artificial intelligence to European regulation of Big Tech. During their White House meeting last week, Trump and Zuckerberg revisited those themes, discussing AI, including plans for Meta’s massive data center in rural Louisiana, along with what the two men see as regulatory overreach in Europe, according to one of the people.

Trump publicly touted the Louisiana data center during a Cabinet meeting on Tuesday, holding up a graphic provided to him by Zuckerberg showing the project superimposed over a map of Manhattan to demonstrate its scale. Trump said he was told the data center would cost $50 billion and expressed awe at its scope.

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