Ritter later worked as a security and military consultant for the Fox News network. U-2 having been loaned to UNSCOM, but caused Ritter to be subjected to criticism and investigation by U. Beginning in December 1997, Ritter, with the approval of UNSCOM head Richard Butler and other top UNSCOM leaders, began to supply the UK's foreign intelligence service MI6 with documents and briefings on UNSCOM's findings to be used for MI6's propaganda effort dubbed "Operation Mass Appeal": "I was approached by the British intelligence service, which I had, again, a long relationship with, of an official nature, to see if there was any information in the archives of UNSCOM that could be handed to the British, so that they could in turn work it over, determine its veracity, and then seek to plant it in media outlets around the world, in an effort to try to shape the public opinion of those countries, and then indirectly, through, for instance, a report showing up in the Polish press, shape public opinion in Great Britain and the United States.
Ritter also had "a long relationship [...] of an official nature" with the UK's foreign intelligence spy agency MI6 according to an interview he gave to Democracy Now! from 1991 to 1998 as a United Nations weapons inspector in Iraq in the United Nations Special Commission (UNSCOM), which was charged with finding and destroying all weapons of mass destruction and WMD-related manufacturing capabilities in Iraq. "I went to Richard Butler with the request from the British.
Bill Clinton said, "This proves the Iraqis are not cooperating," and he ordered the inspectors out.
The ten crates of missile parts were stashed in a basement of the Baghdad headquarters of Saddam's own Ba'ath party.Prior to the invasion of Iraq in March 2003, Ritter stated that Iraq possessed no significant weapons of mass destruction (WMD) capabilities, becoming "the loudest and most credible skeptic of the Bush administration’s contention that Hussein was hiding weapons of mass destruction." He received harsh criticism from the political establishment but became a popular antiwar figure and occasional talk show commentator as a result of his stance.