Transportation Secretary Sean Duffy warned Sunday that flights across the country could be delayed or even canceled due to the ongoing government shutdown as staffing shortages at air traffic control facilities spread nationwide.

Speaking with ABC News' "This Week" co-anchor Martha Raddatz while a ground stop was in effect at Newark Liberty International Airport, Duffy said "We will delay, we will cancel, any kind of flight across the national airspace to make sure people are safe" amid the shortages.

"There is a level of risk that gets injected into the system when we have a controller that's doing two jobs instead of one," he added.

According to the Federal Aviation Administration, nearly 50% of all major air traffic control facilities face staffing shortages. Air traffic controll

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