Posts on social media over the weekend indicated passengers at Chicago's O'Hare International Airport waited upward of four hours in winding lines, eliciting criticism from elected Illinois officials.

Gov. J.B. Pritzker tweeted at President Donald Trump and Vice President Mike Pence, noting that the customs process is under federal jurisdiction and demanding they take action to address the crowds. His concerns were echoed on Twitter by his fellow Democrats, Illinois Sens. Dick Durbin and Tammy Duckworth.

The Trump administration should have bolstered staffing at the receiving airports in anticipation of long lines, Pritzker said Sunday on ABC's "This Week," but instead passengers "were flooding into O'Hare Airport, they were stuck in a small area, hundreds and hundreds of people, and that's exactly what you don't want in this pandemic."

Sunday, he said, "its going to be even worse."

While U.S. citizens, green card holders and some others are allowed to return home, travelers from Europe are being funneled to one of 13 U.S. airports where they are subject to health screenings and quarantine orders.

Acknowledging the long lines at those airports in tweets posted just after midnight, the Department of Homeland Security's acting secretary said the screenings take about a minute per passenger.

"Right now we are working to add additional screening capacity and working with the airlines to expedite the process," Chad Wolf tweeted. "I understand this is very stressful. In these unprecedented times, we ask for your patience."