Japanese Internment was done under an executive order issued by Democrat Franklin Delano Roosevelt. All of the Supreme Court justices who voted that Korematsu's internment was constitutional (it was a 6-3 decision) were appointees of Democrat Franklin Delano Roosevelt.
Update: Not to take away from Fred Korematsu, but the real Japanese-American heroes were the men who fought for the USA in Europe. Sadao Munemori, RIP
AoSHQ: Morning Report has some interesting links and flashbacks
TOM: Democrats face some bad political math
Flashback: Dems blocked orphan refugees