The conservative-leaning Weekly Standard proceeded to predict the end of CBS's news division. At this time, Dan Rather first acknowledged there were problems in establishing the validity of the documents used in the report, stating: "If the documents are not what we were led to believe, I'd like to break that story." CBS also hired a private investigator to look into the matter after the story aired and the controversy began. Copies of the documents were first released to the public by the White House. Press Secretary Scott McClellan stated that the memos had been provided to them by CBS in the days prior to the report and that, "We had every reason to believe that they were authentic at that time." The Washington Post reported that at least one of the documents obtained by CBS had a fax header indicating it had been faxed from a Kinko's copy center in Abilene, Texas, leading some to trace the documents back to Burkett. CBS states that use of the documents was a mistake As a growing number of independent document examiners and competing news outlets reported their findings about the documents, CBS News stopped defending the documents and began to report on the problems with their story. On September 20 they reported that their source, Bill Burkett, "admits that he deliberately misled the CBS News producer working on the report, giving her a false account of the documents' origins to protect a promise of confidentiality to the actual source." While the network did not state that the memos were forgeries, CBS News president Andrew Heyward said, Based on what we now know, CBS News cannot prove that the documents are authentic, which is the only acceptable journalistic standard to justify using them in the report. We should not have used them. That was a mistake, which we deeply regret. Dan Rather stated, "if I knew then what I know now – I would not have gone ahead with the story as it was aired, and I certainly would not have used the documents in question." In an interview with Rather, Burkett admitted that he misled CBS about the source of the documents, and then claimed that the documents came to him from someone he claimed was named "Lucy Ramirez", whom CBS was unable to contact or identify as an actual person. Burkett said he then made copies at the local Kinko's