Washington (CNN)Hillary Clinton's presidential campaign and the Democratic National Committee helped fund research that led to the now-infamous dossier of allegations about President Donald Trump and Russia, a source familiar with the matter told CNN. The source said the law firm Perkins Coie, as part of its representation of the Clinton campaign and the DNC, retained the intelligence firm Fusion GPS and entered "into an engagement for research services that began in April 2016 and concluded before the election in early November." The Washington Post was first to report the news Tuesday.