I remember this from 2019. It took about a month for the pilot/flight attendant/ATC unions to put ‘urge’ and end to the shutdown for safety concerns, this is part of their statement:

Due to the shutdown, air traffic controllers, transportation security officers, safety inspectors, air marshals, federal law enforcement officers, FBI agents, and many other critical workers have been working without pay for over a month. Staffing in our air traffic control facilities is already at a 30-year low and controllers are only able to maintain the system’s efficiency and capacity by working overtime, including 10-hour days and 6-day workweeks at many of our nation’s busiest facilities. source

I’m afraid I’m team TSA-is-pageantry. However, TSA should not go without pay regardless and ATC being stressed about finances concerns me.