WASHINGTON, DC - OCTOBER 08:  (AFP OUT) President Barack Obama participates in a conference call with state and local officials to discuss the Administration's domestic preparedness response to the Ebola epidemic in West Africa, at the White House on October 8, 2014 in Washington, DC. The first person diagnosed with Ebola in the United States, Liberian Thomas Duncan, has died at a Dallas hospital, Texas Health Presbyterian Hospital announced today. (Photo by Dennis Brack-Pool/Getty Images)