it is well established, in general, that republican attack strategy involves presenting a complex issue as a soundbyte that is generally false, but easily repeated--and then to repeat it over and over and exhaust those seeking the truth
it was against hillary that they developed the experience needed with this strategy to use it on others.
they did so long before she had any elected power. they did it to fight her senate campaign. and of course they did it at great length over every perceived scandal during her tenure as SoS. the facts of the benghazi case, for example, have been so muddled by republican repeat lying that you're much more likely to know the GOP narrative than the truth.