In his opening statement, the chairman of the House Oversight and Government Reform Committee, Rep. Jason Chaffetz, R-Utah, accused Comey of setting "a dangerous" precedent that will allow officials to "sloppily" handle classified information with "no outcome".
"We have no basis to conclude she lied to the FBI", Comey said, answering further questions.
In his testimony, Comey said that Clinton's actions made USA secrets more vulnerable to such hostile forces.
Donald Trump, the presumptive Republican presidential nominee, has said Clinton is guilty at least of "stupidity and bad judgment" and has said he thinks the justice system is "rigged".
He told Congress on Thursday: "We don't want to put people in jail unless we prove they knew they were doing something they shouldn't do...." If officials throughout the State Department believed that the information was not classified, Clinton can reasonably continue to insist that she didn't know, either.
"He (Comey) defined all the allegations as being contradictory to what Ms. Clinton actually did, so it validated that there was a problem", Gosar said after the hearing.
Paul called the recommendation an outrage, saying that the Federal Bureau of Investigation demonstrated over 100 incidents of Hillary Clinton endangering national security and violating procedures.
US President Barack Obama today ducked questions about an FBI investigation into Hillary Clinton's use of a private email account for sensitive government business.
"I do not believe that all of the professionals that I dealt with in the State Department were careless in handling classified material, " Clinton said in an interview Friday on MSNBC.
"Comey said this information wasn't properly marked in that the emails didn't have a classification header, even though a "(c)" immediately preceded text in the body of the emails, designating confidential information.
If the FBI's decision to not prosecute Hillary Clinton is accepted, we will have become a nation of two sets of laws: one for the Clintons, and one for everyone else.
"In his statement on Tuesday, Director Comey said, "[This] is not to suggest that in similar circumstances, a person who engaged in this activity would face no consequences.
Though Gowdy, a former prosecutor, was probably the best at it, it wasn't particularly hard for any of the members of the panel to make Clinton look duplicitous and reckless because, well, the facts are pretty damning. Clinton had said publicly she never sent or received any classified information.
But Comey, who was grilled on Thursday by a Republican-led House oversight committee, did slam Clinton and her team for being "extremely careless" in handling classified information.
"I have said, and I repeat, that it was a mistake to use personal email", she added. Comey said the cases draw some good contrast, especially because Petraeus lied to law enforcement and the classified information he had was found hidden inside the insulation of his attic.
"She also used her personal email extensively while outside the United States, including sending and receiving work-related e-mails in the territory of sophisticated adversaries", Comey said.
A group of Republicans senators has introduced legislation to strip Clinton of her security clearance.
FBI Director James Comey was on Capitol Hill this week testifying on his decision to not recommend a prosecution of Hillary Clinton in regards to her management of emails during her tenure as Secretary of State.