Johnson is not as well versed in the immigration and disaster response side of the Homeland Security Department, although the administration official pointed out the Pentagon also coordinates federal relief to respond quickly to disasters.
Former Defense Secretary Leon Panetta praised Johnson's selection Thursday, saying he has "impeccable judgment, leadership qualities and high ethical standards."
At the Pentagon, Johnson was involved in the decision to move Army Pfc. Chelsea Manning from a military jail in Quantico, Virginia to Fort Leavenworth, Kansas. Supporters of Manning, the young soldier who leaked thousands of classified documents to WikiLeaks, said conditions at the military jail in Virginia were too harsh.
Johnson sparked criticism when he said in a speech at Britain's Oxford University last November that the war on terror was not an endless conflict and that the U.S. was approaching a "tipping point" after which the military fight against al-Qaida would be replaced by a law enforcement and intelligence operation.
"War must be regarded as a finite, extraordinary and unnatural state of affairs," Johnson said. "In its 12th year, we must not accept the current conflict, and all that it entails, as the new normal."
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Associated Press writers Alicia A. Caldwell and Lolita C. Baldor contributed to this report.
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