A trove of leaked emails from Democratic presidential nominee Hillary Clinton's inner circle reveal a tricky balancing act the former secretary of State faced trying to appease both unions and environmental groups before announcing her opposition to the Keystone XL pipeline last year. Senior Clinton aides in the summer of 2015 debated about the timing and tone of her reaction to President Obama's imminent rejection of the Keystone XL pipeline and how to "soften the blow" to trade unions, according to emails Wikileaks obtained from an account belonging to Clinton's campaign chairman, John Podesta.
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