Transportation Secretary Sean Duffy said Sunday that airport delays are "going to get worse" as the government shutdown threatens to stretch into a fifth week and air traffic controllers were not paid this week.

"I think the real consequence is, what kind of rolling delays do you have throughout the system, right?" Duffy said on "Face the Nation with Margaret Brennan ." "We've seen problems at L.A., in Dallas, in D.C., Boston, Atlanta. And so I think it's only going to get worse."

Duffy said the federal government will "stop traffic" if it becomes a safety issue, adding, "We're not going to let that happen."

Duffy's appearance comes as ground delays were reported at major airports on Sunday, including a four-hour ground delay at Newark Liberty Airport, one of the nation's busies

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