While on a leisurely stroll promoting her new book "Hard Choices," Hillary Clinton was asked to personalize a copy of her novel. When she asked what name to sign, the man replied: "Christopher Stephens - I think you knew him."

Stephens is a former US Ambassador to the embassy in Benghazi, Libya. He and three other Americans died in a September 11th, 2012 attack when Clinton and the rest of the Obama administration failed to provide adequate protection. 

When she asked for the man's real name, he replied: "What difference does it make?" Sound familiar? "What difference does it make?!"

The man seen making the request in the video is Jason Mattera, a YouTuber and Conservative author known for his "ambush" style interviews.

Watch Hillary's full reaction to the request below... 

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