He lies because that's what he does.
He lies because he's Fred Trump's son. The apple fell very close to the tree.
Fred taught Donald how to cheat on taxes, lie about everything and discriminate against everybody who isn't a millionaire.
Ivanka, Don Jr. and Eric are carrying on that tradition of corruption.
Ivanka sat in front a camera and with a straight face said Trump had nothing to do with getting Jared Kushner top security clearance DESPITE the objections of John Kelly and the FBI.
They are nothing but a crime family.
.