Republican Congressman Darrell Issa claimed Tuesday that the FBI's decision not to pursue criminal charges against Hillary Clinton confirms her belonging to a political class that lives "by a different set of rules."

"The FBI decision shows once again how the Clintons and others at the top get to live by a different set of rules from everyone else," Issa tweeted.

The former House Oversight Committee chairman has been a leading critic of Clinton and warned last week that the "tainted Justice Department" can't be trusted to "openly, honestly or appropriately" investigate the former secretary of state.

"The latest revelations about Attorney General Lynch only confirm this unfortunate but inescapable conclusion. At this point, only one entity can truly render a timely verdict in this matter: the American people," Issa told Breitbart News.

During a press conference Tuesday, FBI Director James Comey described Clinton as being "extremely careless" with the multiple email servers she kept during her tenure at the State Department.

To recommend criminal charges, however, Comey said agency officials would have to have found evidence that the presumptive Democratic presidential nominee knowingly mishandled classified information.

"In looking back at our investigations into mishandling or removal of classified information, we cannot find a case that would support bringing criminal charges on these facts," he told reporters.

"All the cases prosecuted involved some combination of clearly intentional and willful mishandling of classified information, or vast quantities of materials exposed in such a way as to support an inference of intentional misconduct, or indications of disloyalty to the United States, or efforts to obstruct justice."

"We do not see those things here," Comey confirmed.