WASHINGTON – After a Bill that would force TikTok’s Chinese parent company to sell the app or face a nationwide ban sailed through the House at breakneck speed this week, its progress has slowed in the Senate.

Senator Chuck Schumer of New York, the Democratic leader who determines what legislation gets a vote, has not decided whether to bring the Bill to the floor, his spokesperson said.

Senators – some of whom have their own versions of Bills targeting TikTok – will need to be convinced. Other legislation on the runway could be prioritised. The process of taking the House Bill and potentially rewriting it to suit the Senate could be time-consuming.

Many in the Senate are keeping their cards close to their vest about what they would do on the TikTok measure, even as they said they recognised the House had sent a powerful signal with its vote on the Bill, which passed 352-65.

The legislation mandates that TikTok’s parent company, ByteDance, sell its stake in the app within six months or face a ban.

“The lesson of the House vote is that this issue is capable of igniting almost spontaneously in the support that it has,” Senator Richard Blumenthal, who is from Connecticut, said in an interview on March 15.

The Democrat said there could be adjustments made to the Bill but that there was bipartisan support to wrest the app from Chinese ownership.

The slowdown in the Senate means that TikTok is likely to face weeks or even months of uncertainty about its fate in the United States.

That could result in continued lobbying, alongside manoeuvring by the White House, the Chinese government and ByteDance. It is likely to also prompt potential talks about deals – whether real or imagined – while the uncertainty of losing access to the app will hang over the heads of TikTok creators and its 170 million US users.

“Almost everything will slow down in the Senate,” said Mr Nu Wexler, a former Senate aide who worked for Google, Twitter and Meta, which owns Facebook and Instagram.

“They’ll need some time to either massage egos or build consensus.”

The House approved the legislation just over a week after it was introduced, passing it with bipartisan support on concerns that the app could endanger American users’ data or be used as a Chinese propaganda tool.

The Bill also received support from the White House.

After saying last week that he opposed the legislation, former president Donald Trump said he now supported it in an interview with Fox News on March 15.

The Bill has angered China, with an official saying the US had “never found any evidence of TikTok posing a threat to US national security”.

China could move to block a sale if the legislation does pass.

Some lawmakers have worried that the Bill could exceed Congress’ mandate by mentioning TikTok specifically, running afoul of a constitutional ban on targeting individuals in laws.

TikTok has argued that the secretive drafting of the Bill and the speed at which it passed in the House suggested that lawmakers were aiming for a ban rather than a sale.

TikTok, which has repeatedly said it has not and would not share data with the Chinese government or allow any government to influence its algorithmic recommendations, has scrambled to respond to the Bill, which took the company by surprise.

On March 13, Mr Shou Chew, TikTok’s Singaporean chief executive, posted a video addressing users, saying a ban of the service would hurt small businesses in the US. He urged them to call their senators and fight back.

The company did the same with House representatives last week.

TikTok has spent more than $1 billion (S$1.34 billion) on an extensive plan known as Project Texas – because of its partnership with Austin, Texas-based Oracle – that aims to handle sensitive US user data separately from the rest of the company’s operations.

The plan also provides for independent and government oversight of the platform to monitor for manipulation.

On March 15, searching “KeepTikTok” on the app brought up a banner asking Americans to “tell your Senator how important TikTok is to you”.

The message asked users to input their zip codes, which then informed them of the correct lawmaker to call.

“We continue educating members of our community about the rushed ban Bill, how it would trample their constitutional right of free expression, and how they can make their voices heard,” Mr Alex Haurek, a spokesman for TikTok, said in a statement.

Senate offices have received hundreds of phone calls and voicemail messages about the Bill from TikTok users in recent days, said two Senate aides, who were not authorised to discuss the calls publicly. The aides said many calls appeared to come from underage people.

The White House is also lobbying behind the scenes, surprising some talent agencies that represent TikTok creators on March 15 by inviting them to a briefing “concerning social media platform ownership”, according to an e-mail received by two attendees, who spoke on the condition of anonymity because the call was off the record.

The attendees said White House National Security spokesman John Kirby emphasised that the White House sought a divestment of TikTok to a group of representatives from talent agencies like Creative Artists Agency and Viral Nation.

They added that there were several questions about how the agencies’ clients and their jobs would be affected by the legislation.

A White House spokesperson declined to comment on the call.

Congressional experts said the Senate would probably be tougher to crack because its smaller number of individual members were more likely to try to put their own stamp on the legislation.

A single member objecting to a measure could make it difficult to fast-track legislation. In addition, it also still needs to consider and pass an important package of spending Bills before a deadline for a partial government shutdown.

“I think senators are going to do their due diligence,” said Ms Lindsay Gorman, a senior fellow at German Marshall Fund.

“There’s going to be some rigorous conversation about this exact question: whether we just need to move or if there’s room to tinker.”

Some senators have come out in support of the Bill. The leaders of the Intelligence Committee, Senator Mark Warner from Virginia, a Democrat state, and Senator Marco Rubio from Florida, a Republican state, said in a statement on March 13 that they would support the Bill moving forward in the Senate.

Mr Warner, who has his own TikTok proposal, said on March 13 that he was still asking questions about various elements of the Bill but was cheered by the momentum it carried coming out of the House.

“There are lots of bases that need to be touched,” Mr Warner said. But, he added, it was “hard to think of anything else that’s garnered over 350 votes in a House that’s otherwise not had a record of being fully functioning”.

Others have been more circumspect. Mr Blumenthal said in the interview that the Senate had to review aspects of the Bill, adding that a six-month deadline to reach a sale deal might not be long enough.

He also said he had “heard about a number of very credible and prominent groups” that were interested in buying TikTok but had not yet been reported in the press.

“There is a clear path to achieving all of the interests here – preserving TikTok but simply putting it in different hands,” he added.

Senator Maria Cantwell from Washington, who is also the chair of the Senate Committee on Commerce, Science and Transportation, is likely to have influence over whether the House legislation gets a vote in the Senate.

The Democrat said in 2023 that she was drafting her own legislation to deal with TikTok, and she has been non-committal about whether she will support a vote on the House legislation.

She said in a statement after it passed the House that she planned to work with colleagues to “try to find a path forward that is constitutional and protects civil liberties”.

A spokesperson for the Commerce Committee declined to make Ms Cantwell available for an interview. NYTIMES