O'Hare International Airport photo posted on Twitter by Brooke Geiger McDonald.
Shocking photos emerged on Saturday evening of large crowds and long lines at multiple airports across America.
Dr. Seema Yasmin said the travel restrictions can "create situations perfect for super-spreading events."
Gov. J.B. Pritzker (D-IL) lashed out at President Donald Trump on Twitter:
"The crowds & lines O’Hare are unacceptable & need to be addressed immediately," he said.
He said he was posting the message on Twitter because "this is the only communications medium you pay attention to."
"The federal government needs to get its s@#t together," Pritzker added. "NOW."
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