Donald Trump Says He’s Going to Ban TikTok. But Can He Actually Do That?

Donald Trump said he will move as soon as Saturday to ban TikTok from the U.S., several weeks after the administration first said it was considering taking such an action against the popular Chinese-owned social video app over concerns that it’s a threat to national security.

“As far as TikTok is concerned, we’re banning them from the United States,” Trump said Friday, speaking to reporters on Air Force One. Microsoft was said to be in talks to acquire TikTok from ByteDance, the Beijing-based internet company, but Trump said he opposed such a deal, per NBC News.

Regarding banning TikTok, “I have that authority,” Trump claimed, saying he could use emergency economic powers or an executive order to enforce the decision. TikTok has maintained that it has never provided user data to Chinese authorities and it wouldn’t if the communist regime requested it.

But it’s not clear how a Trump order to “ban” TikTok would work — or if it would stand up in court. The Trump administration might try to threaten to punish Apple and Google if they carry TikTok in their U.S. app stores, by adding TikTok to the Commerce Department’s list of foreign entities that “present a greater risk of diversion to weapons of mass destruction (WMD) programs, terrorism, or other activities contrary to U.S. national security and/or foreign policy interests.”

The U.S. government last year added Chinese telecom equipment manufacturer Huawei to the “entity list,” prompting Google and others to cut off their business with Huawei. But putting TikTok on that list would be unusual and legally dubious, James Lewis, director of technology policy at the Center for Strategic and International Studies (CSIS), recently told The Verge. There’s no evidence TikTok has engaged in criminal activity threatening U.S. national security, although TikTok was fined for alleged violations of the U.S.’s child data-privacy law (which the FTC is reinvestigating).

The Trump administration also could try to invoke the International Emergency Economic Powers Act to impose economic sanctions that would block Apple and Google from publishing the TikTok app. This, however, also has a high legal threshold: The law requires that the president first declare a national emergency (which can be nullified by Congress) in the event of an “unusual and extraordinary threat, which has its source in whole or substantial part outside the United States, to the national security, foreign policy, or economy of the United States.” For Trump to enact a ban via the IEEPA, he would need to explain to Congress why TikTok represents an “unusual and extraordinary” danger, according to the law.