The meeting took place in the FBI's Sensitive Compartmented Information Facility, which is specifically vetted for conversations that involve top secret information, according to ABC News

ADVERTISEMENT

Clinton, the Democratic presidential nominee, was inside for just over two hours, an ABC News reporter tweeted , before going to her home in Chappaqua, N.Y.

The Clinton campaign has not specified which advisers also attended the briefing and receive classified information.

Some top Republicans have questioned whether Clinton should receive classified briefings after the the FBI Director James Comey described her handling of classified information as secretary of State as "extremely careless."

However, the White House said that there are no grounds to stop the national security briefings that are crucial for "a smooth transition to the next president."

"Ensuring a smooth transition to the next president is a top priority ... and that's important, in part, because of the significant threats around the world," White House press secretary Josh Earnest said last month.

"[Intelligence officials] understand what steps are necessary to protect sensitive national security information, and the administration is confident that they can both provide relevant and sufficient briefings to the two major-party presidential candidates while also protecting sensitive national security information," he added.

Trump brought New Jersey Gov. Chris Christie and a former Defense Intelligence Agency director Lt. Gen. Michael Flynn with him.

—Updated at 11:48 a.m.