TikTok and Chinese parent ByteDance have urged a US court to strike down a law they say will ban the popular short video app in the United States on January 19, saying the US government refused to engage in any serious settlement talks after 2022.
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Legislation signed in April by President Joe Biden gives ByteDance until January 19 next year to divest TikTok's US assets or face a ban on the app used by 170 million people in the country.
ByteDance says a divestiture is "not possible technologically, commercially, or legally."
The US Court of Appeals for the District of Columbia will hold oral arguments on lawsuits filed by TikTok and ByteDance along with TikTok users on September 16.
TikTok's future in the United States may rest on the outcome of the case which could affect how the US government uses its new authority to clamp down on foreign-owned apps.
"This law is a radical departure from this country's tradition of championing an open internet, and sets a dangerous precedent allowing the political branches to target a disfavoured speech platform and force it to sell or be shut down," ByteDance and TikTok argue in asking the court to strike down the law.
Driven by worries among US lawmakers that Chinese authorities could access data on US citizens or spy on them with the app, the measure was passed overwhelmingly in Congress just weeks after being introduced.
Lawyers for a group of TikTok users who have sued to prevent the app from being banned said the law would violate their free speech rights.
In a filing on Thursday, they argued it is clear there are no imminent national security risks because the law "allows TikTok to continue operating through the rest of this year - including during an election that the very president who signed the bill says is existential for our democracy".
TikTok says any divestiture or separation - even if technically possible - would take years and it argues that the law runs afoul of the US public's free speech rights.
Further, it says the law unfairly singles out TikTok for punitive treatment and "ignores many applications with substantial operations in China that collect large amounts of US user data, as well as the many US companies that develop software and employ engineers in China".
ByteDance recounted lengthy negotiations between the company and the US government that it says abruptly ended in August 2022.
The company also made public a redacted version of a 100-plus page draft national security agreement to protect US TikTok user data and says it has spent more than $US2 billion ($A3 billion) on the effort.
The draft agreement included giving the US government a "kill switch" to suspend TikTok in the United States at the government's sole discretion if the company did not comply with the agreement and says the US demanded that TikTok's source code be moved out of China.
"This administration has determined that it prefers to try to shut down TikTok in the United States and eliminate a platform of speech for 170 million Americans, rather than continue to work on a practical, feasible and effective solution to protect US users through an enforceable agreement with the US government," TikTok lawyers wrote the Justice Department in an April 1 email made public on Thursday.
The Justice Department declined to comment on the email but said last month the law "addresses critical national security concerns in a manner that is consistent with the First Amendment and other constitutional limitations".
It said it would defend the legislation in court.
The law prohibits app stores like those of Apple and Alphabet's Google from offering TikTok.
It also bars internet hosting services from supporting TikTok unless it is divested by ByteDance.
Australian Associated Press
