"All who believe in this country’s values must vote for Democrats this fall. Policy differences don’t matter right now. History has its eyes on us,” the former FBI chief tweeted.
The letter suggested Comey's actions had been motivated by self-interest.
He still only gives the current president one out of ten.
"This report is vital in shedding light for future leaders on the nature and quality of our investigation and the decisions we made.”
The president's lawyer claimed he could not be subpoenaed or indicted while in office.
The lawyer previously suggested the investigation would end by fall.
"So disgraceful that the questions concerning the Russian Witch Hunt were 'leaked' to the media," President Donald Trump said.
The former FBI director said Clinton's "respect for institutions" suggested she would not have fired him as Trump did.
"I thought about the Ramsey Rapist every night before I went to bed for five years," the former FBI director said.
Comey wants Republicans to think about how they would answer their grandchildren in the future if they ask about the events of today.
Representative Claudia Tenney was one of 11 Republicans to sign a petition calling on Hillary Clinton, James Comey and others to be investigated.
Blaming a letter rather than her supercilious nature, malleable positions, or terrible campaign strategy continues to feed the perception that the election process was somehow compromised.
“I don’t crave to be known,” Comey said.
President Donald Trump told former FBI Director James Comey that he had "serious reservations” about the judgment of his former national security adviser Michael Flynn, according to leaked memos obtained by the Associated Press.
Comey spoke with CNN's Jake Tapper following the release of his book.