Senator Ted Cruz said on Sunday that neither of the Obama administration’s explanations for not banning travel from countries with active and uncontrolled Ebola outbreaks makes sense.

Speaking with Candy Crowley on CNN’s State of the Union, the Texas Republican and potential 2016 presidential candidate pointed out that federal public-health authorities’ boast of having set up screening at five airports is meaningless because those five airports do not include Dallas Fort Worth, final destination of the late Thomas Eric Duncan, who died of Ebola in a Dallas hospital after transmitting the deadly hemorrhagic fever virus to at least two other people — the first known domestic human-to-human transmissions of Ebola in U.S. history.

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Cruz also pointed out that the screenings are ineffective because they detect only carriers who are demonstrating symptoms.

“Ebola unfortunately has a 21-day incubation period,” Cruz said, “where the patient has no demonstrated symptoms and walks right through the screening. Mr. Duncan, the one patient we know who did come from Liberia to America, would have walked right through the screenings.”