Trump hasn't made a decision yet, and his legal team will spend the weekend doing research and reading through a Justice Department inspector general's report to determine whether they can make a case that Mueller's investigation is invalid because of findings of bias at the FBI, Giuliani said.
The findings have no direct bearing on a separate Justice Department special counsel probe on Russia's alleged interference in the election, and the possibility there was collusion between the Trump campaign and Moscow.
The report also criticized FBI agent Strzok and former FBI lawyer Page, who were having an affair, for exchanging anti-Trump text messages that "cast a cloud" over the credibility of the investigation, but found no evidence "that these political views directly affected the specific investigative decisions that we reviewed".
The report documents in painstaking detail one of the most consequential investigations in modern FBI history and reveals how the bureau, which for decades has endeavoured to stand apart from politics, came to be entangled in the 2016 presidential election. Moreover, as we describe in Chapter Nine, in assessing Strzok's decision to prioritize the Russian Federation investigation over following up on the Midyear-related investigative lead discovered on the Weiner laptop in October 2016, these text messages led us to conclude that we did not have confidence that Strzok's decision was free from bias. Both Strzok and Page worked on the Clinton probe.
Trump later added that he had tried to stay "uninvolved" in the Justice Department, stating Deputy Attorney General Rod Rosenstein was "not happy" with the IG report.
"Well I don't know how Peter Strzok is still working there", Trump responded.
Trump himself said he had "reservations" about a sit-down with the investigators. This investigation is specifically related to the Clinton email investigation.
Obama said in a 2015 interview with CBS News that he first learned of Clinton's use of the private server "at the same time everybody else learned it through news reports".
The Justice Department inspector general does not conclude that political preferences influenced Mr Comey or the Justice Department.
Meanwhile, two Republican-led House committees say their own months-long probe into the now-closed FBI investigation of Hillary Clinton's emails has so far shown "questionable decision-making" by the agency.