Clinton’s ads could use Trump’s own words against him, but they may not stick; that’s why Trump has been called a Teflon candidate, as was Reagan. The Clinton campaign can try to brand Trump a liar, but though fact-checkers have given him a record number of pants-on-fires and Pinocchios, people aren’t joining or leaving him because of accuracy; that’s not what a protest movement is about.  Besides, fact-checking just plays into Trump’s applause line that the media are disgusting liars.