It only takes one lie for someone to be a liar.
Why do you have such an issue with someone rebutting your hatred of Trump by reminding you that there have been others who lied, yet you no doubt said not one word about it?
You also--obviously--think I'm defending Trump.  Where did I defend him?  I think he's an egotistical, petulant jerk.  However, if either of us is "harping", it would be you.  Every time anything about Trump is regurgitated by the DP from the AP or WaPo, you're all over it.  What good do you think it will do?  When was the last time you heard me mention Obama's lie that I posted above?
So, who's the one harping?  Get over yourself.