Supreme Court Justice Ruth Bader Ginsburg on Monday refused to comment on whether Donald Trump's call for a temporary ban on Muslims entering the U.S. is constitutional.

"Can you ban an entire religious group from entering the country?" Yahoo News anchor Katie Couric asked. "Is that constitutional?

"I think the question you asked is a question that could come before this court. I can't preview what my decision would be. I can't answer a hypothetical question when it may turn into a real question."

Ginsburg said she requires lower court rulings, lawyers' briefings and legal commentary before judging issues of magnitude like banning Muslim emigration.

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