Thursday's New York Times has a report on how the highly suspicious dossier alleging that Donald Trump was compromised by Russian intelligence agents came into existence. Among the other interesting revelations was that the dubious opposition research report was put together by the research firm Fusion GPS: The story began in September 2015, when a wealthy Republican donor who strongly opposed Mr. Trump put up the money to hire a Washington research firm run by former journalists, Fusion GPS, to compile a dossier about the real estate magnate's past scandals and weaknesses, according to a person familiar with the effort....