Explain who ordered Japanese-Americans into the internment camps?

Following the attack on Pearl Harbor, the American
government felt the need to intern all individuals of Japanese ancestry or ethnicity
under the cloak of national security.  President Franklin Delano Roosevelt himself
authorized this:

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President Franklin Delano Roosevelt authorized
the internment with Executive Order 9066, issued February 19, 1942, which allowed local
military commanders to designate "military areas" as "exclusion zones," from which "any
or all persons may be excluded." This power was used to declare that all people of
Japanese ancestry were excluded from the entire Pacific coast, including all of
California and most of Oregon and Washington, except for those in internment
camps.

Roosevelt's Executive
Order 9066 indicated many particular elements about how internment was to be handled and
how Japanese individuals were to be treated by the U.S. Government.  His order allowed
the military to declare "exclusion zones" where citizen or non-citizen deemed to be a
threat could be placed.  In one of the first "enemy combatant" moves by the government,
Roosevelt was able to embolden the executive branch and its extensions to ensure that
anyone of Japanese or Korean ancestry be detained in these facilities.  In doing so,
Roosevelt was able to tap into public sentiment that targeted individuals whose
ancestral nations were allied against the United States.  In the process he was able to
galvanize more public support for the aims of the war effort.