Politicians have lied before, but this is not an old problem getting worse. Indeed, past presidents have sometimes paid dearly for the mere appearance of a lie. A man of great good character and a lifetime of public service, President George H.W. Bush said, "Read my lips," which was branded a lie, and he lost an election. Accusations of lying — "Lying Hillary" — tainted Hillary Clinton's run for president. President Bill Clinton told a lie in public and under oath and the scandal got him impeached. The impeachment gained some weight from the sound legal principle that a liar in one thing is likely to lie about other things. That principle should be applied to Trump.