In August 2007 "Newsweek" reported that in April 1998 a dozen people from what it called "the denial machine" met at the American Petroleum Institute's Washington headquarters. The meeting included Singer's group, the George C. Marshall Institute, and ExxonMobil. Newsweek said that, according to an eight-page memo that was leaked, the meeting proposed a $5-million campaign to convince the public that the science of global warming was controversial and uncertain. The plan was leaked to the press and never implemented. The week after the story, "Newsweek" published a contrary view from Robert Samuelson, one of its columnists, who said the story of an industry-funded denial machine was contrived and fundamentally misleading. ABC News reported in March 2008 that Singer said he is not on the payroll of the energy industry, but he acknowledged that SEPP had received one unsolicited charitable donation of $10,000 from ExxonMobil, and that it was one percent of all donations received. Singer said that his connection to Exxon was more like being on their mailing list than holding a paid position. The relationships have discredited Singer's research among members of the scientific community, according to Scheuering. Congresswoman Lynn Rivers questioned Singer's credibility during a congressional hearing in 1995, saying he had not been able to publish anything in a peer-reviewed scientific journal for the previous 15 years, except for one technical comment.