Director of the U.S. Centers for Disease Control and Prevention Tom Frieden listens via video conference as U.S. President Barack Obama holds a meeting with cabinet agencies coordinating the government's Ebola response in the Cabinet Room of the White House in Washington October 15, 2014. Obama cancelled a fund raising trip today to hold the meeting. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH) 

U.S. President Barack Obama holds a meeting with cabinet agencies coordinating the government's Ebola response, in the Cabinet Room of the White House in Washington October 15, 2014. From left are Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, Lisa Monaco, assistant to the president for homeland security and counterterrorism, Health and Human Services Secretary Sylvia Burwell, Secretary of Defense Chuck Hagel and Homeland Security Secretary Jeh Johnson. Obama pledged on Wednesday that federal officials would oversee the response to U.S. Ebola cases in a more aggressive way, and said the Centers for Disease Control would send a "SWAT team" to any hospital encountering a new case of the disease. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH DISASTER) 

Centers for Disease Control and Prevention (CDC) Director Tom Frieden listens via videoconference as U.S. President Barack Obama holds a meeting with cabinet agencies coordinating the government's Ebola response, in the Cabinet Room of the White House in Washington October 15, 2014. Seated on Obama's side of the table are (from L) U.S. Ambassador to the UN Samantha Power, Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, Lisa Monaco, assistant to the president for homeland security and counterterrorism, Health and Human Services Secretary Sylvia Burwell and Secretary of Defense Chuck Hagel. Obama pledged on Wednesday that federal officials would oversee the response to U.S. Ebola cases in a more aggressive way, and said the Centers for Disease Control would send a "SWAT team" to any hospital encountering a new case of the disease. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH DISASTER) 

U.S. President Barack Obama (3rd R) holds a meeting with cabinet agencies coordinating the government's Ebola response in the Cabinet Room of the White House in Washington October 15, 2014. From left are Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey, Lisa Monaco, assistant to the president for homeland security and counterterrorism, Health and Human Services Secretary Sylvia Burwell, Secretary of Defense Chuck Hagel and Homeland Security Secretary Jeh Johnson. Obama abruptly postponed a political trip today in what was a sign of growing concern about the deadly virus. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH DISASTER) 

Director of the U.S. Centers for Disease Control and Prevention Tom Frieden, listens via video conference as U.S. President Barack Obama (not pictured) holds a meeting with cabinet agencies coordinating the government's Ebola response in the Cabinet Room of the White House in Washington October 15, 2014. Obama cancelled a fund raising trip today to hold the meeting. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH DISASTER) 

Director of the U.S. Centers for Disease Control and Prevention Tom Frieden, listens via video conference as U.S. President Barack Obama (R) holds a meeting with cabinet agencies coordinating the government's Ebola response in the Cabinet Room of the White House in Washington October 15, 2014. Obama cancelled a fund raising trip today to hold the meeting. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH DISASTER) 

White House spokesman Josh Earnest fields a question about Ebola during a press briefing at the White House in Washington October 15, 2014. A second Texas nurse who has contracted Ebola flew on a commercial flight from Ohio to Dallas with a slight temperature the day before she was diagnosed, health officials said on Wednesday, raising new concerns about U.S. efforts to control the disease. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH) 

White House spokesman Josh Earnest answers a question about Ebola during a press briefing at the White House in Washington October 15, 2014. A second Texas nurse who has contracted Ebola flew on a commercial flight from Ohio to Dallas with a slight temperature the day before she was diagnosed, health officials said on Wednesday, raising new concerns about U.S. efforts to control the disease. REUTERS/Kevin Lamarque (UNITED STATES - Tags: POLITICS HEALTH)