For most of the hearing Comey kept his cool.
He said that given the sophistication of foreign hackers and the fact that hackers did infiltrate commercial email accounts of people who emailed with Clinton, "we assess that we would be unlikely to see such direct evidence".
CHAFFETZ: Was the Clinton foundation tied into this investigation?
Asked if he was referring to Clinton, Gowdy said, "She's one of 100 witnesses".
While Comey asserts that Clinton was cooperative with the FBI during its investigation, Petraeus was caught lying.
Iowa Republican Congressman Rod Blum asked Comey about the security of Hillary Clinton's private email server.
"Secretary Clinton said all work-related emails were returned to the State Department", Gowdy said. Clinton placed her compulsion for privacy and personal convenience above the security interests of the country.
The tale of two e-mails with the cryptic marks in their text illustrates the complexity of the politically charged debate over Clinton's use of a private e-mail server for official business when she was secretary of state.
Comey said it would depend on the circumstances.
FBI Director James Comey strongly defended his decision not to prosecute presidential candidate Hillary Clinton over her use of a private email server during a congressional panel hearing on Thursday.
"I believe and have said many times that I take classified material seriously", Clinton said in an interview with NBC. But Attorney General Loretta Lynch accepted his recommendation not to bring charges in the case.
During their exchange, Comey admitted that Clinton, despite her claims of innocence, shared classified information from multiple devices and failed to turn over all of her work-related emails after she was ordered to do so.
He cited comments by Clinton in which she said she did not send or receive any emails marked as classified.
"Across government you're seeing this problem", he said.
CHAFFETZ: Do you know who paid for that? The department had suspended its probe while it was waiting for the Justice Department to complete its criminal investigation.
"The system is rigged", tweeted out presumptive GOP nominee Donald Trump shortly after Comey's announcement.
Comey presided over a year-long investigation and said Tuesday that the matter should be closed with no criminal charges.
House Speaker Paul Ryan, for instance, asked the Office of the Director of National Intelligence to block access to classified briefings for Clinton for the rest of the campaign.
"We're all very partisan here", Cooper said.