Subject: Re: Joe Biden sent the orders
Was the imprisonment of American citizens on the basis of race Constitutional?

It was found to be so, yes. The question isn't whether the Supreme Court always gets it right (and Korematsu is an infamous decision) - it's whether the President's actions are, in fact, subject to SCOTUS review to determine whether they are within the scope of his Constitutional powers.

They are. Ever since Marbury v. Madison, the Court has reserved to itself the right to tell the other branches whether their actions comply with the scope of their Constitution authority.