Top Democratic senator: I've read Rod Rosenstein's memo on James Comey 3 times, and each time it gets worse
"The memo appears to have been hastily assembled to justify a preordained outcome," Feinstein said, adding that it reads more like a "political document" than "meaningful analysis."
"Given Rosenstein's legal expertise and 27-year Justice Department career, I would have expected him to produce a detailed and comprehensive rationale for Director Comey's firing, including input from the agents and staff who worked with Director Comey," she continued.
Feinstein, a Democrat from California and the top Democrat on the Senate Judiciary Committee, also said that the memo cites months-old quotes from op-eds and media appearances, and no current insights from within the FBI.
Feinstein's statement also called for Rosenstein and Attorney General Jeff Sessions to recuse themselves from the "appointment, selection and reporting of" a special counsel to investigate the Trump campaign's contacts with Russia.
Thursday's statement is one several Feinstein has issued in recent days regarding Comey's firing, with each appearing more critical than the last.
Her original statement on Comey's firing was two sentences long, and said his replacement "must be strong and independent and will receive a fair hearing in the Judiciary Committee." The following day, Feinstein questioned the timing of Comey's firing, and whether it was because of the ongoing Russia investigation.
"If Director Comey was fired to stifle the FBI's Russia investigation - and the timing of this action makes that a real possibility - that simply cannot be allowed to happen," she said.