FOX News' John Roberts reports the Justice Department is expanding its investigation into the origins of the 2016 Trump campaign probe as well as the timeline. FNC learned that Mueller was not accurate when he told Congress that he was not interviewing for the position of FBI director when he met President Trump in the Oval Office in May 2017. According to documents obtained by Judicial Watch in a Freedom of Information request, then-Deputy Attorney General Rod Rosenstein and talked to Mueller about becoming special counsel before he met with President Trump. <blockquote>JOHN ROBERTS, FOX NEWS: A senior administration official tells FOX News exclusively, that the investigation into the genesis of the Russia probe is expected to be released later this month and that its findings will be detailed. The Justice Department inspector general Michael Horowitz has been looking into whether there were abuses of the FISA system to begin surveillance of Trump campaign officials that ultimately led to the Mueller investigation. Sources also say another investigation into the Russia probe. This one headed up by veteran prosecutor John Durham has been expanded based on what Durham is finding. He has added staff and agents and has widened the timeline of the investigation past election day and into the spring of 2017 when Robert Mueller was appointed special counsel. No word on when Durham's investigation will be completed. FOX News has also learned that Mueller was not accurate when he told Congress on July 24th that he was not interviewing for the position of FBI director when he met President Trump in the Oval Office in May of 2017. <i>MUELLER: My understanding was I was not applying for the job. I was asked to give my input on what it would take to do the job. </i> Multiple administration officials tell FOX News that when Mueller met the president on May 16th, 2017, he was indeed pursuing the post left open by the firing of James Comey a week earlier. In fact, Mueller was looking at two possible jobs. FBI director and special counsel. According to documents obtained by Judicial Watch in a Freedom of Information request, Deputy Attorney General Rod Rosenstein had talked with Mueller about the possibility of becoming special counsel before he met with President Trump. In an email dated May 12th, Rosenstein wrote to Mueller, quote, "the boss and his staff do not know about our discussions." The day after Mueller met with the president, Rosenstein appointed him as special counsel. The president's former outside attorney was outraged that Mueller interviewed for the FBI position knowing that he could become special counsel. John Dowd telling FOX News Mueller's actions were, "the most dishonorable conduct I have ever witnessed."</blockquote> <script type="text/javascript" src="https://video.foxnews.com/v/embed.js?id=6093271491001&w=640&h=360"></script><noscript>Watch the latest video at <a href="https://www.foxnews.com">foxnews.com</a></noscript>