Glenn Simpson, whose Fusion GPS firm has been tied to anti-Trump efforts and pro-Russian lobbying, will not talk to lawmakers in response to a subpoena, the leaders of the Senate Judiciary Committe said Friday.... ..."Simpson’s attorney has asserted that his client will invoke his Fifth Amendment rights in response to the subpoena," Grassley and Feinstein said. During the campaign, Fusion GPS contracted former MI-6 agent Christopher Steele to look into rumors about Trump's financial and social connections in Russia.