Half-truths are lies.
Don't be a liar.
In fairness to the other poster, I try to never call someone a liar unless I am absolutely convinced that the person knew that his statement was inaccurate or false when he made the statement. Maybe I give too much benefit of the doubt sometimes, but I consider the charge of "liar" to be such a serious offense that I reserve it only for those that I am thoroughly convinced are deliberately lying and not just speaking from ignorance.
Well he didn’t vote to convict President Clinton on the first charge—perjury. That is a fact. It is not a half truth.