Nadler's request to the FBI includes documents related to "Mueller's firing" in June or Dec. 2017.
Did Trump actually fire Mueller? Was he forced to walk it back?
https://judiciary.house.gov/sites/democrats.judiciary.house.gov/files/documents/FederalBureauofInvestigationA.pdf
This is from Nadler's letter to the FBI:
h) The actual or possible resignation or termination of:
i) Jeff Sessions, including but not limited to any discussion involving President Trump regarding Sessionss possible resignation or firing on or about May 17, 2017, July 2017, and November 2018;
ii) Rod Rosenstein, including but not limited to any discussion involving President Trump regarding Rosensteins possible resignation or firing throughout 2018;
iii) Robert Mueller, including but not limited to any discussion involving President Trump regarding Muellers firing on or around June 2017, or any conversation in which President Trump stated, in words or substance, that he wanted the Mueller investigation shut down, restrained, or otherwise limited in or around December 2017.