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It's something, since the nomination and confirmation hearings of Justice Ginsberg, that's really become kind of an unwritten rule, this "I can't answer a question if it's a potential issue that's going to come before me on the Supreme Court." I think that most senators have come to accept that as a very legitimate answer. They don't love it, they're not happy, but it is legitimate when you put it in that context.

Source: www.esquire.com
It's something, since the nomination and confirmation hearings of Justice Ginsberg, that's really become kind of an unwritten rule, this I can't answer a question if it's a potential issue that's going to come before me