According to a Cato Institute report Congress has approved over $12 trillion monopoly bucks in so called "Emergency " spending in the past 3 decades.

Congress has complete discretion in designating spending for emergencies because what qualifies as an emergency is subject to interpretation,

Curbing Federal Emergency Spending | Cato Institute (https://www.cato.org/policy-analysis/curbing-federal-emergency-spending-government-spending-grows-excessive-wasteful)

From the lawmakers trying to make a pork sausage point of view ;it gives them the power to go beyond discretionary spending limits . They turned a break the glass one time exception into a standard practice.

Emergency! Everybody to Get From Street! - YouTube (https://www.youtube.com/watch?v=QGgJPmOUmDU)