A federal appeals court on Friday left in place a mid-January deadline in a federal law requiring TikTok to be sold or face a ban in the United States, rejecting a request made by the company to halt enforcement until the Supreme Court reviews its challenge of the statute.

It's not clear if the Supreme Court will take up the case. If the law is not overturned, both TikTok and its parent, ByteDance, have said that the popular app will shut down by Jan. 19.

The Supreme Court on Friday said it would take up a business-backed appeal that could make it easier to challenge federal regulations, acting in a dispute related to California's nation-leading standards for vehicle emissions.

California wants to move away from gas-powered cars. But 'the Golden State is not the golden child,' 17 states complained to the Supreme Court.

Ohio and 16 other Republican-dominated states have sued, asserting that a waiver granted to California to set its own rules violates the basic design of the U.S. Constitution, which they assert should treat states as equals.