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WASHINGTON, DC - MARCH 21:  Deputy U.S. National Security Adviser Benjamin Rhodes (R) speaks as National Security Adviser Susan Rice (L) listens during the White House Daily Briefing at the James Brady Press Briefing Room of the White House March 21, 2014 in Washington, DC. Rich spoke on President Obamas upcoming trip to Europe and the current situation in Ukraine.  (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - MARCH 21:  Deputy U.S. National Security Adviser Benjamin Rhodes (R) speaks as National Security Adviser Susan Rice (L) listens during the White House Daily Briefing at the James Brady Press Briefing Room of the White House March 21, 2014 in Washington, DC. Rich spoke on President Obamas upcoming trip to Europe and the current situation in Ukraine.  (Photo by Alex Wong/Getty Images)

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U.S. Deputy National Security Adviser Ben Rhodes tells Christiane Amanpour the White House is "deeply concerned" about the situation in Aleppo.