The letter that was filed in court said that Fusion GPS began working for the law firm, Perkins Coie, in April 2016. Written by the firm’s general counsel, Matthew J. Gehringer, the letter said that Fusion GPS had already been conducting the research “for one or more other clients during the Republican primary contest.”
Gehringer wrote that in March 2016, Fusion approached Perkins Coie to see if its clients would be interested in paying Fusion "to continue research regarding then-presidential candidate Donald Trump, research that Fusion GPS had conducted for one or more other clients during the Republican primary contest." The DNC and Clinton campaign engaged Fusion in April to "perform a variety of research services during the 2016 election cycle."
Once again, the Republican narrative doesn't fit the facts found in the court documents. Facts don't have a side, they're just facts.