Comey set off a firestorm by telling the chairmen of eight congressional committees that the FBI would take "appropriate investigative steps" to determine whether newly discovered emails found in an unrelated investigation contain classified information and to assess whether they are relevant to the investigation involving Clinton's private email server. The unrelated case was an investigation of former Congressman Anthony Weiner, the estranged husband of top Clinton aide Huma Abedin.
Justice officials have said that before Comey notified Congress they warned him that doing so would go against long-standing practices of the department to not comment on ongoing investigations and to not take steps that could be viewed as influencing an election.
Officials familiar with Comey's decision said that he felt a sense of obligation to legislators to "supplement" his testimony under oath in July that the Clinton investigation was complete and there would be no charges. Comey was also concerned that word of the new email discovery would leak to the media and raise questions of a coverup, the officials said.
Charles Grassley the Republican chairman of the Senate Judiciary Committee wrote to Comey today saying that the disclosure he provided to Congress last week "did not go far enough" and was unfair to Congress and the American people.
"In the absence of additional, authoritative information from the FBI in the wake of your vague disclosure, Congress and the American people are left to sift through anonymous leaks from Justice Department officials to the press of varying levels of detail, reliability, and consistency," he wrote. "The American people deserve better than that."
Grassley asked Comey to answer by November 5 a series of questions about the email discovery and what the FBI has learned so far about their contents.
Grassley's request adds to the increasing pressure on Comey to release more details and clarify his letter to Congress. A bipartisan group of about 100 former federal prosecutors and senior Justice Department officials have also called on Comey to release more information.
Over the weekend, Comey reached out to the House Judiciary Committee Chairman Bob Goodlatte and the panel's ranking member, John Conyers. Goodlatte told ABC News that he spoke briefly with Comey in a joint conversation with Conyers.
"We both encouraged him to make sure that the American people have as much information as possible before they have to make a decision on November 8th, based upon this stunning new development, that the bureau is examining new evidence in this case, that they said they had completed several months ago," Goodlatte said.
Goodlatte said that Comey was not responsive to specific questions.
"He did not give us any response in terms of what more he could say," Goodlatte said. "But he certainly took that under advisement."
White House spokesman Josh Earnest praised Comey as "a man of principle . . . integrity and talent," and said that President Barack Obama, who nominated Comey three years ago to serve a 10-year sentence, does not believe that he is trying to influence the presidential election.