Why is Hillary Clinton being quizzed again over Benghazi?

Democratic presidential nomination front runner Hillary Clinton is due to give evidence to Congress over the 2012 attack on the US embassy in Benghazi for the second time. But why now?

THURSDAY 22 OCTOBER 2015
The attacks resulted in the deaths of the ambassador Chris Stevens and three other Americans: Sean Smith; Glen Doherty; and Tyrone Woods. The current congressional inquiry into the raids - and America's preparedness for them - is the eighth. And Thursday's session will mark the second time Hillary Clinton has been called before Congress to testify.

Why is Hillary Clinton Being Quizzed Again Over Benghazi by Thavam Ratna