Wouldn't this have more in common with the beloved FDR's imprisonment of an entire ethnic group during a war?
Unless someone is talking about sealing the borders to ensure no one can escape their plans for total extermination of the ethnic group, I really don't want to hear Nazi comparisons.
The incarceration of Japanese-Americans applied to only some of the states.
It was difficult to determine which Japanese-Americans were disloyal (probably because there were practically no disloyal Japanese-Americans). There were obvious examples of disloyal German-Americans and Italian-Americans. Even if it was wrong, Japanese-Americans were treated with comparative kindness in their internment.
The database that Donald Trump proposes is based upon religion. As such it certainly violates the freedom of religion as established in the First Amendment as well as several other parts of the Constitution.
This proposal falls neatly into the "don't even think about it" category. By saying this Donald Trump is completely unqualified to be President. He's a ruthless demagogue.