The timeline of events leading up to last month’s deadly attack in Benghazi and the administration’s shifting explanations have become a major problem for Democrats less than a month before Election Day.

Already under criticism for linking the assault on the U.S. consulate to an anti-Islam video, the administration raised even more eyebrows Thursday when Vice President Biden said he didn’t know about the U.S. mission’s request for more security. Biden’s statement directly contradicts sworn testimony from State Department officials given just the day before.

The following is a detailed timeline of events leading to the Sept. 11 attack and what the Obama administration has said since then.

• April 5, 2011: Special envoy Christopher Stevens arrives in the rebel stronghold of Benghazi to forge ties with the forces battling Moammar Gadhafi. President Obama appoints him as ambassador to Libya on May 22, 2012.

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