New checks for passengers flying from West Africa

New York's JFK International Airport is the first of five airports to add enhanced screening for Ebola.

Over the weekend, passengers flying into the U.S. from West Africa faced the tougher protocol at JFK, and more thorough screenings will begin at other airports soon, but some members of Congress say it's not enough.

Starting Thursday, Chicago's O'Hare Airport, Dulles International Airport outside of Washington D.C., Hartsfield-Jackson Airport in Atlanta and Newark International Airport in New Jersey will all have the new screening in place, reports CBS News transportation correspondent Jeff Pegues.

U.S. authorities say those airports manage more than 94 percent of travelers from Liberia, Sierra Leone and Guinea, the West African countries hardest hit by Ebola.

Despite the stepped-up measures, even the Centers for Disease Control and Prevention acknowledges the new system is not fool-proof.

"We can't get the risk to zero," CDC director of division of global migration and quarantine Dr. Martin Cetron said. "That will not be the case. But this additional layer should add a measure of security and assurance to the American public."

Some members of Congress believe the best way to reassure the public is to institute an all out travel ban.

A group of Democrats and Republicans have signed a letter urging the president to cut off the flow of passengers from West Africa "until such countries have defeated the epidemic."

On "Face the Nation," House Homeland Security chairman, Republican Michael McCaul, said more needs to be done.

"I think we need to target more the individuals themselves and look at the idea of potentially temporarily suspending the 13,000 visas that would be coming out of this region," he said.

The head of the CDC is on the record saying that an all-out travel ban would impede the health workers getting in and out of West Africa and others have said it could be counterproductive, allowing Ebola to spread to other African countries.