Abortion will certainly be a key issue in tonight's CNN debate between Donald Trump and Joe Biden. And just hours before the two meet at CNN's world headquarters in Atlanta, the Supreme Court issued a ruling that, for now, allows emergency abortions in Idaho when the mother's health is at risk. At first glance, it's a big win for abortion rights forces fighting against states' efforts to further restrict abortion access. But they did not settle the big legal question at issue: whether federal guarantees for emergency medical care supersede Idaho's effort to impose an almost total abortion ban. 

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