A day after it was approved by the Senate, US President Joe Biden has officially signed a foreign aid package that includes the TikTok ban bill “Protecting Americans from Foreign Adversary Controlled Applications Act.”

The clock is now ticking for TikTok which must divest from China-based parent company ByteDance or face a ban in the US. The company has an initial nine months to negotiate a deal but that could be extended by another three months if the presidential office sees progress.

“This unconstitutional law is a TikTok ban, and we will challenge it in court,” TikTok said in a statement. “We believe the facts and the law are clearly on our side, and we will ultimately prevail. The fact is, we have invested billions of dollars to keep U.S. data safe and our platform free from outside influence and manipulation. This ban would devastate seven million businesses and silence 170 million Americans. As we continue to challenge this unconstitutional ban, we will continue investing and innovating to ensure TikTok remains a space where Americans of all walks of life can safely come to share their experiences, find joy, and be inspired.”

The “Protecting Americans from Foreign Adversary Controlled Applications Act” containing the TikTok bill passed through Congress without hassle. The original version of the bill had a six-month divest window, but an updated version with a 12-month window brought some lawmakers who were on the fence on board ahead of its approval last Saturday.

In a video posted on TikTok, CEO Shou Zi Chew said the decision is “obviously a disappointing moment” for TikTok. “Make no mistake, this is a ban, a ban on TikTok, and a ban on you and your voice,” he said. “We are confident, and we will keep fighting for your rights in the courts. The facts and the Constitution are on our side, and we expect to prevail again.”