The Transportation Security Administration (TSA) said Sunday that many of its employees are not reporting to work because of "financial limitations," a statement that comes as the government shutdown persists into its fifth week. 

"[Saturday's] complete figures show that TSA experienced a national rate of 8 percent of unscheduled absences compared to a 3 percent rate one year ago on the same day," TSA said in a statement released Sunday afternoon. "Many employees are reporting that they are not able to report to work due to financial limitations."

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The statement added that "airports may exercise contingency plans due to call-outs and traveler volume in order to maintain effective security standards," noting that it took that step at Baltimore/Washington International Thurgood Marshall Airport due to "excessive callouts."

TSA closed a checkpoint at Baltimore/Washington International Thurgood Marshall Airport over a lack of staffing on Saturday.

The event occurred about a week after Houston's George Bush Intercontinental Airport closed one of its checkpoints

The government shutdown, which was triggered on Dec. 22 after Democratic and Republican lawmakers failed to reach an agreement on a spending bill, has impacted thousands of federal workers, including TSA agents, across the nation. 

TSA agents, as essential personnel, have been forced to work without pay.

A union president for the TSA said earlier this month that some agents have already walked off their jobs amid the shutdown, which is now the longest in U.S. history. 

"Every day I’m getting calls from my members about their extreme financial hardships and need for a paycheck. Some of them have already quit and many are considering quitting the federal workforce because of this shutdown,” said Hydrick Thomas, the TSA council president for the American Federation of Government Employees.