Three Russian investors are suing private investigation firm Fusion GPS and its founder Glenn Simpson for libel over the handling of an intelligence dossier containing salacious allegations against President Donald Trump.Mikhail Fridman, Petr Aven and German Khan filed suit Tuesday in U.S. District Court in Washington, claiming that their reputations were unfairly tattered by the so-called dossier—a largely unsubstantiated document that has taken on a larger-than-life role in several investigations into alleged collusion between the Trump campaign and Russia."Even though the Dossier contained unverified allegations, Defendants recklessly placed it beyond their control and allowed it to fall into the hands of media devoted to breaking news on the hottest subject of the day: the Trump candidacy," the suit alleges.