U.S. health officials are stepping up efforts to study the link between Zika virus infections and birth defects, citing a recent study estimating the virus could reach regions where 60 percent of the U.S. population lives.
Obama was briefed on the potential spread of the virus by his top health and national security officials in January.
"The president emphasized the need to accelerate research efforts to make available better diagnostic tests, to develop vaccines and therapeutics, and to ensure that all Americans have information about the Zika virus and steps they can take to better protect themselves from infection," the White House said in a statement.
The virus has been linked to brain damage in thousands of babies in Brazil. There is no vaccine or treatment for Zika, a close cousin of dengue and chikungunya, which causes mild fever and rash. An estimated 80 percent of people infected have no symptoms, making it difficult for pregnant women to know whether they have been infected.
On Monday, the World Health Organization predicted the virus would spread to all countries across the Americas except for Canada and Chile.
In a blog post, National Institutes of Health Director Dr. Francis Collins cited a Lancet study published Jan. 14 in which researchers predicted the Zika virus could be spread in areas along the East and West Coasts of the United States and much of the Midwest during warmer months, where about 200 million people live.
The study also showed that 22.7 million more people live in humid parts of the country where mosquitoes carrying the virus could live year round.
Given the threat, Collins said "it is now critically important to confirm, through careful epidemiological and animal studies, whether or not a causal link exists between Zika virus infections in pregnant women and microcephaly in their newborn babies." Microcephaly results in babies being born with abnormally small heads.