A new ad that brutally exposes Donald Trump's hypocrisy vis-a-vis illegal immigration did not come from any of his current opponents, but rather Our Principles PAC, an anti-Trump group led by former Mitt Romney aide Katie Packer. The ad opens by asserting that the reason Trump is skipping Thursday"s GOP debate is "Trump can't handle tough questions, like why he'd let millions of illegal immigrants stay in America and even supports a pathway to citizenship." The ad then shows Trump addressing a Chicago audience last June, sounding as if he endorsed giving illegal immigrants a path to citizenship. Trump lectured,...