Vice President Joe Biden was on Capitol Hill Wednesday to discuss security lapses at different U.S. diplomatic posts around the world and address lawmakers’ concerns that the facilities could be vulnerable to another deadly attack like the one in Benghazi, Libya last year.

Biden was supposed to meet with Sen. John McCain, R-Ariz., and other members, but had to reschedule because McCain was busy rounding up Republican votes needed to confirm Obama’s pick to head the Bureau of Alcohol, Tobacco, Firearms and Explosives.

A administration official confirmed that the meeting took place but did not respond to a request to comment on the details of the closed-door conversation.

The vice president met with a bipartisan, bicameral group to update them on the administration's efforts to secure our diplomatic facilities and personnel around the world,” said the official.

The meetings on Capitol Hill, which weren’t listed on Biden’s public schedule, come just as a confidential internal report raised fresh questions about the State Department’s commitment to safety in the aftermath of the Benghazi tragedy that left the U.S. ambassador and three others dead.

We were talking to the vice president about embassy security,” McCain told the Washington Examiner. “We’ve got decisions that have to be made about embassies and consulates, and [the administration] wants to consult with us on it. It’s a serious issue.”

The Washington Times last week first reported on a State Department’s inspector general’s report that directly criticizes the Bureau of Diplomatic Security for failing to perform a physical inspection before approving the security plan for the U.S. Embassy in Kabul, Afghanistan, which was the target of a bold attack by Taliban insurgents two years ago.