FILE - In this Nov. 13, 2014, file photo Vice President Joe Biden, with Ebola Response Coordinator Ron Klain, left, and White House Senior Adviser Valerie Jarrett, meets with faith and humanitarian groups as part of the administration's response to Ebola in the Eisenhower Executive Office Building on the White House compound in Washington. Klain is preparing to serve as President-elect Joe Biden’s chief of staff, a job often referred to as the nation’s chief operating officer. (AP Photo/Manuel Balce Ceneta, File)

FILE - In this Jan. 11, 1997, file photo provided by the White House, President Clinton listens during a meeting with his Cabinet members at the Blair House in Washington. From left are Vice President Gore, National Security Adviser to the Vice President Leon Fuerth, Secretary of Labor Robert Reich, Secretary of Labor-designate Alexis Herman, Secretary of Energy Hazel O'Leary, Acting U.S. Trade Representative Charlene Barshefsky, National Security Advisor Anthony Lake, Counselor to the President Thomas "Mack" McClarty, Deputy Secretary of the Treasury Lawrence Summers, Chief of Staff to the Vice President Ron Klain, and Secretary of Health and Human Services Donna Shalala. (White House via AP, File)

FILE- In this Oct. 22, 2014, file photo, reporters take notes as Ebola coordinator Ron Klain listens to President Barack Obama speak to the media about the government's Ebola response in the Oval Office of the White House in Washington. New federal Ebola response squads are being readied to rus to an U.S. city where a new Ebola case might be identified, officials said. Klain is preparing to serve as President-elect Joe Biden’s chief of staff, a job often referred to as the nation’s chief operating officer. (AP Photo/Jacquelyn Martin, File)

FILE - In this Oct. 5, 2016, file photo American political operative Ron Klain arrives at Democratic presidential candidate Hillary Clinton's home in Washington. Klain is preparing to serve as President-elect Joe Biden’s chief of staff, a job often referred to as the nation’s chief operating officer. (AP Photo/Andrew Harnik, File)

FILE - In this Nov. 4, 2014, file photo Centers for Disease Control and Prevention director Dr. Thomas Frieden, left, and Ebola coordinator Ron Klain, attend a meeting with President Barack Obama and members of his national security and public health teams to receive an update on the Ebola response in the Roosevelt Room of the White House in Washington. Klain is preparing to serve as President-elect Joe Biden’s chief of staff, a job often referred to as the nation’s chief operating officer. (AP Photo/Jacquelyn Martin, File )

FILE - In this Feb. 11, 2015, file photo outgoing Ebola czar Ron Klain listens as President Barack Obama speaks about the Ebola outbreak response by the U.S. in West Africa in the South Court Auditorium of the White House complex in Washington. Klain is preparing to serve as President-elect Joe Biden’s chief of staff, a job often referred to as the nation’s chief operating officer. (AP Photo/Jacquelyn Martin, File)