Romney's campaign confirmed to ABC News on Thursday that Ryan, Romney's vice presidential nominee, had received his first intelligence briefing. The campaign did not provide any other details about the briefings.

Romney, meanwhile, received his second briefing on Thursday.

The campaign announced on Sept. 13 that both Romney and Ryan would begin receiving intelligence briefings. Presidential candidates and their vice presidential picks traditionally receive briefings during the general election season of the presidential campaign.

Romney's second briefing, which lasted two hours, was at a CIA building in Dulles, Va., on Thursday, according to ABC News. Romney received his first briefing while in Los Angeles on Sept. 17.