An anti-Hillary Clinton group ran a television ad during last night's Democratic debate showing the faces of the four men who died in the 2012 terror attack on the American embassy in Benghazi, Libya.

The Democratic presidential front-runner, who was secretary of state at the time, has been under scrutiny for her response to the tragedy and conflicting information in the wake of the attacks.

The ad, which was created by the Stop Hillary PAC, asserts that Clinton ignored the calls for help during the attack.

It features a voiceover with images of the victims, Glen Doherty, Tyrone Woods, Sean Smith and J. Christopher Stevens, closing with an image of Stevens' gravestone.

Dear Hillary Clinton,

I'd like to ask you why you ignored calls for help in Benghazi, and then four Americans were murdered.

I'd like to know why you lied, saying the attack was a response to an Internet video.

I'd like to hear why you tried to silence the Benghazi whistleblower.

But, Mrs. Clinton, I can't. What difference does it make?

Watch Rep. Jason Chaffetz (R-UT) react on "The Kelly File" above and see the ad below.

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