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Former Secretary of State Hillary Clinton fielded hecklers who hounded her on Benghazi at the tail end of an award acceptance speech she delivered at the National Constitution Center in Philadelphia on Tuesday evening.

Mrs. Clinton was accepting the 2013 Liberty Medal, an honor to recognize her career in public service and advocacy for women’s rights, CBS reported. She told the crowd of hundreds of the U.S. need to balance national security with human rights issues in Syria, and called for American politicians to cross party aisles and strike a chord of unity.

“When we fail to make progress on the challenges facing our people at home, our standing in the world suffers,” she said, Breitbart.com reported.

The mostly bland speech received an energy boost at the tail end, when a protester in the midst of the crowd starting chanting: “Benghanzi! Benghazi! Benghazi!”