The app’s availability in the U.S. has been thrown into jeopardy over data privacy and national security concerns.

Returning President Donald Trump, ahead of his second term in office, said Sunday that TikTok users "deserve to see" his "exciting inauguration" as he promised an extension that would keep the app from staying dark.

TikTok's CEO is expected to attend president-elect Donald Trump's inauguration on Monday, according to multiple US media outlets, as some Democratic lawmakers and the incoming administration try to help the Chinese-owned app avert a ban in the US.

The crowded scene in the Capitol Rotunda on Inauguration Day featured four of the world’s five wealthiest men, five U.S. presidents, influential sporting figures and two other foreign leaders with prime seats on the dais.

The chief executive of TikTok, which went dark but then returned over the weekend, was among the tech executives who attended President Trump's inauguration. NBC News' Savannah Sellers reports.

Cabinet members, governors, and long-serving public servants are positioned in rows behind the tech billionaires, with only family seated ahead of them.

Elon Musk, Jeff Bezos, Mark Zuckerberg and Sundar Pichai mingled with Trump’s cabinet picks at the Capitol. Trump Plans to Declare National Emergency at US Border José Andrés Says This Is the Best Substitute for Salt Freed Israeli hostage speaks out for first time,