Tonight, the Supreme Court upholding a law that could ban TikTok in the U.S., but will it actually

be enforced.

The unanimous ruling allowing the ban to take effect just days from now for TikTok's 170 million

users in the U.S. unless its Chinese owner sells it, citing national security concerns.

But the Biden administration saying it will leave TikTok's

ultimate fate in the hands of President-elect Trump, what he's saying tonight and what happens to

your phone Sunday if the law takes effect. Also tonight, the winter storm sweeping from the plains to the northeast.

An Arctic blast bringing the coldest air of the season to tens of millions, and that deep freeze

forcing Monday's inauguration to be moved inside for the first time in 40 years, the last-minute

scramble. The confirmation hearing for President-elect Trump's homeland security pick,

Christy Knoe, when she revealed about the immigration overhaul he plans on day one.

The battle against California's wildfires, new tonight, many of the 31 people still missing,

now identified. Moments ago, Israel's full cabinet approving the Gaza ceasefire deal,

new details on how and when the hostages will be released. And it started as a way

to help her friends displaced by the fires after a boost by some big names, the overwhelming

response. This is NBC Nightly News with Lester Holt. Good evening and welcome.

The future of a wildly popular social media app that has helped define a younger generation

of Americans is being decided at the country's highest levels tonight.

First, the Supreme Court today upheld a law that would ban TikTok from operating in the U.S.

That ban was sent to go into effect Sunday, but there is now growing uncertainty,

as the Biden administration, which in the past has called the Chinese-owned app national security risk,

now says it will let the Trump administration deal with it all.

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