Trump on Monday set September 15 as the deadline for TikTok to find a US buyer, failing which he said he will shut down the app in the country. In an unusual declaration, Trump also said any deal would have to include a "substantial amount of money" coming to the US Treasury.

"Right now they don't have any rights unless we give it to them. So if we're going to give them the rights, then ... it has to come into this country," Trump said. "It's a great asset, but it's not a great asset in the United States unless they have approval in the United States."

The President's requirement that some of the money from the deal go to the US Treasury doesn't have a basis in antitrust law, according to Gene Kimmelman, a former chief counsel for the US Department of Justice's Antitrust Division and currently a senior adviser to the policy group Public Knowledge.

"This is quite unusual, this is out of the norm," Kimmelman said. "It's actually quite hard to understand what the president is actually talking about here. ... It's not unheard of for transactions to have broader geopolitical implications between countries, but it's quite remarkable to think about some kind of money being on the table in connection with a transaction."

TikTok said it remains committed to its large American user base.

"TikTok is loved by 100 million Americans because it is a home for entertainment, self-expression, and connection," company spokesperson Josh Gartner said in a statement. "TikTok will be here for many years to come."

Microsoft says it is still discussing a potential purchase of TikTok, days after Trump first said he would ban the popular short-form video app from operating in the US.

In a blog post Sunday, Microsoft said its CEO, Satya Nadella, has talked with Trump about buying the app, which is owned by Chinese startup ByteDance. US policymakers have for weeks expressed concerns about the app as tensions between the US and China escalate, with many asserting that it could pose a national security risk. (Security experts, however, say the threat is largely theoretical or indirect.)

"[Microsoft] is committed to acquiring TikTok subject to a complete security review and providing proper economic benefits to the United States, including the United States Treasury," the company said, adding that it will "move quickly" to talk with ByteDance "in a matter of weeks."

Microsoft declined to comment beyond the blog post following Trump's remarks on Monday.

The Trump administration has repeatedly targeted the short-form video app in recent weeks, citing concerns over the privacy and security of its American users. In response, TikTok has pointed to the fact it has an American CEO and that its servers reside in the US. The company previously considered a restructuring to ease concerns.

"This is a purchase that wouldn't be necessary but for the Trump administration's hostility to Chinese ownership of any tech companies," said Mark Lemley, director of Stanford University's program in

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