JOHN YANG: In today's other news, President Biden and President-elect Trump spent the final full day of their current roles by thanking supporters, but in very different ways.

Before his second tour of duty as Commander in Chief, Mr. Trump visited Arlington National Cemetery and laid a wreath at the Tomb of the Unknown Soldier.

This evening at a downtown Washington, D.C. Sports arena, Mr. Trump is to hold what's being billed as a MAGA victory rally.

For the final full day of his presidency, Mr. Biden visited with supporters in Charleston, South Carolina, the state that revitalized his faltering campaign in 2020.

He attended a church service and visited Charleston's International African American Museum.

TikTok has restored service to the 170 million users of the social media app less than 24 hours after it went dark because of a federal ban.

TikTok powered back on.

That was after President elect Trump said that once in office, he would try to give the China based parent company more time to find a government approved buyer.

The law that banned the act gives the president authority to grant a 90-day extension.

Millions of people across the country are bracing for dangerously cold conditions as a polar vortex moves south from the Arctic.

This latest round of winter weather is expected to bring bitterly cold temperatures, plunging the Northern Plains into single digits.

It's also set to bring a rare bout of freezing rain to the south.

President Biden pardoned the historic leader of the Black Nationalist Movement 85 years after his death.

Marcus Garvey was among five people to receive pardons from Mr. Biden on the eve of his leaving office.

Garvey, who died in 1940, mobilized the Black Nationalist Movement in the early 20th century.

He influenced the next generation of civil rights leaders, including Dr. Martin Luther King Jr. and Malcolm X.

Still to come on PBS News Weekend, how some of the world's biggest companies are making record breaking donations to President-elect Trump's inaugural committee and the modern history of the personal notes outgoing presidents leave their successors.