Never forget that the Weimar Republic's constitution was still technically in place while Nazi Germany committed its atrocities. Anyone who thinks the US will be any different is living in a pipe dream. :/
Wikipedia wrote:
Until the end of World War II in Europe in 1945, the Nazis governed Germany under the pretense that all the extraordinary measures and laws they implemented were constitutional; notably, there was never an attempt to replace or substantially amend the Weimar Constitution. Nevertheless, Hitler's seizure of power (Machtergreifung) had effectively ended the republic, replacing its constitutional framework with Führerprinzip, the principle that "the Führer's word is above all written law".