Byron York: Is 'can't prove untrue' new standard in Trump probe?

When a political figure is accused of wrongdoing, a conversation begins among journalists, commentators, and public officials. Are the charges true? Can the accusers prove it?

That’s the way it normally works. But now, in the case of the Trump dossier – the allegations compiled by a former British spy hired by the Clinton campaign to gather dirt on presidential candidate Donald Trump – the generally accepted standard of justice has been turned on its head. Now, the question is: Can the accused prove the charges false? Increasingly, the president’s critics argue that the dossier is legitimate because it has not been proven untrue.