There's a lot of speculation that it's the real reason the inauguration was moved indoors.

Onward and upward,
airforce

If they're moving it inside because of cold weather, why is the Secret Service expanding the perimeter?

The U.S. Secret Service has expanded their Initial Security Perimeter around the National Mall and other Sites in Washington D.C. for the Inauguration on Monday of President-Elect Donald J. Trump. This comes as Rumors arise that the decision to move the Inauguration from outside… pic.twitter.com/8OzD2Y9aQA

— OSINTdefender (@sentdefender) January 18, 2025

Onward and upward,
airforce

You won't hear this officially, but I'm told what security people are most concerned about is a New Orleans copycat, where someone just tries to mow down as many people as he can with a vehicle.

A kamikazi attack like that is hard to defend against, when you have the whole city to look after.

Onward and upward,
airforce