But he predicted a vaccine is within reach.
Officials on World AIDS Day unveiled new initiatives to treat and prevent the disease.
The infectious disease expert maintains that isolation will disincentivize aid efforts.
Anthony Fauci called Ron Klain an "excellent manager."
Sen. Ted Cruz, Rep. Tim Murphy and National health official Anthony Fauci among guests.
Josh Earnest said details of the plan would be released in the coming days.
Josh Earnest said U.S. would consider steps to make the process more "efficient."
It will take months to produce even a small batch of a promising new drug to counter Ebola.
Just weeks ago, the patient being treated at NIH was in critical condition.
The president will speak at the National Institutes of Health on Tuesday.
His comments come in opposition to the head of the NIH.
Fauci said it would be a different story if officials couldn't easily track people.
"We fully intend to have this patient walk out of this hospital," Dr. Anthony Fauci said.
The director of NIH said some passengers might have their temperature taken.
Lawmakers have pushed for more screening or a travel ban on affected countries.