Hillary Clinton's campaign on jumped to the defense of the presumptive Democratic nominee as the House Oversight Committee's hearing with FBI Director James Comey reached into its second hour. | Getty Clinton camp tweets email defense in real time

As the House Oversight Committee's hearing with FBI Director James Comey reached into its second hour, Hillary Clinton's campaign on Thursday jumped to the defense of the presumptive Democratic nominee.

Clinton spokesman Brian Fallon tweeted links to two separate email chains, which the State Department said Wednesday were marked classified as a result of "human error." During his announcement Tuesday that the FBI would not recommend prosecuting Clinton over her emails, Comey said "a very small number of the e-mails containing classified information bore markings indicating the presence of classified information."

Here are two of the 'marked' emails. State has said both were marked in error https://t.co/blFAVHHafahttps://t.co/jL06DoPXSQ — Brian Fallon (@brianefallon) July 7, 2016

Director Comey affirms, from everything he can tell, Clinton's reason for setting up her personal email system was convenience. Sorry, GOP — Brian Fallon (@brianefallon) July 7, 2016

New facts from hearing:

1. Comey agrees convenience was HRC's reason for setup

2. Comey doesn't believe HRC instructed lawyers doing sorting — Brian Fallon (@brianefallon) July 7, 2016

The classified markings did not need to be on those documents, State spokesman John Kirby explained Wednesday, because once Clinton had decided to make the telephone calls referenced as classified information, "the process is then to move the call sheet, to change its markings to unclassified and deliver it to the secretary in a form that he or she can use."

In another tweet, Fallon made note of Comey's comment that he was "not so sure" someone would have recognized the "(c)" marking as meaning classified.

"Not that she would have no idea what a marking would be, but it's an interesting question I, there's a question about sophistication that came up earlier whether she was actually sophisticated enough to understand what see in [parentheses] means," Comey said.

Rep. Mark Meadows (R-N.C.) then asked Comey whether a "reasonable person" would think that someone of Clinton's stature would understand that.

"I think that's a conclusion a reasonable person would draw, it may not be accurate, but that's what folks would say," Comey said.