Psaki, next White House press secretary, a veteran messenger

FILE - In this June 29, 2011 file photo, from left, White House Communications Director Dan Pfeiffer; Deputy Communications Director Jen Psaki; Senior Adviser David Plouffe; and Press Secretary Jay Carney stand in the East Room as President Barack Obama holds a news conference at the White House in Washington. (AP Photo/Charles Dharapak, File)

FILE - In this April 1, 2015, file photo Jen Psaki, left, and Katie Fallon walk through the West Colonnade of the White House in Washington. (AP Photo/Evan Vucci, File)

FILE - In this Feb. 27, 2015, file photo State Department spokeswoman Jen Psaki listens during a meeting between Secretary of State John Kerry and Liberian President Ellen Johnson at the State Department in Washington. (AP Photo/Pablo Martinez Monsivais, File)

FILE - In this Feb. 16, 2011, file photo Jen Psaki is seen in the James Brady Press Briefing Room of the White House in Washington. (AP Photo/Charles Dharapak, File)