Billionaires, foreign leaders and celebrities including Mike Tyson and Carrie Underwood will appear at the inauguration. Some prominent Democrats are taking a pass.

With the court signaling it will release a decision on Friday, lobbyists for the app pushed lawmakers to shift course.

Shou Chew will join tech moguls like Mark Zuckerberg and Elon Musk at President-elect Donald J. Trump’s inauguration as the fate of the app hangs in the balance.