While what happened in WWII in Nazi Germany to the Jews is the absolute worst example of what a concentration camp can be, that example is at one extreme end of the spectrum. Here is what the definition of concentration camp is, and notice that in the definition it says SOMETIMES they are used for forced labor or mass executions, but not necessarily so. con·cen·tra·tion camp /ˌkänsənˈtrāSHən ˈˌkamp/ noun noun: concentration camp; plural noun: concentration camps a place where large numbers of people, especially political prisoners or members of persecuted minorities, are deliberately imprisoned in a relatively small area with inadequate facilities, sometimes to provide forced labor or to await mass execution. The term is most strongly associated with the several hundred camps established by the Nazis in Germany and occupied Europe in 1933–45, among the most infamous being Dachau, Belsen, and Auschwitz. And yes, these immigrants qualify as persecuted minorities, and, Trump is doing this for pure political reasons.