The mother of a State Department employee killed in Benghazi assailed Hillary Clinton in a speech at the GOP convention, accusing her of lying to her and other families of the victims — both about the cause of the attack on the diplomatic compound and how U.S. officials planned to communicate with her afterward.

She then argued that Clinton belongs behind bars, not in the presidency.

Pat Smith, the mother of Sean Smith, an information officer at the State Department before the attack, said she blames Clinton for the attack that killed her son and three other "brave Americans" that day, including Ambassador Chris Stevens.

"For all this loss, for all this grief, for all of the cynicism the tragedy in Benghazi has wrought upon American, I blame Hillary Clinton," she said to thunderous applause.

"I blame Hillary Clinton personally for the death of my son — that's personally," she added, noting that her son had predicted the attack and his own death the day before it happened.

She also characterized Clinton as lying to families about the circumstances surrounding the death of loved ones for political gain.

"We lost four brave Americans who made the ultimate sacrifice for the country they chose to serve," she said. "And, the American people lost the truth."

"She lied to me and then called me a liar," Smith added.

"When I saw Hillary Clinton at Sean's coffin ceremony, just days later, she looked me squarely in the eye and told me a video was responsible," she said.

"Since then, I have repeatedly asked Hillary Clinton to explain to me the real reason why my son is dead," she said. "I'm still waiting."

Smith noted that she and Clinton are both women and grandparents of two, and asked, "How could she do this to me? How could she do this to any American family?"

She said Donald Trump is "everything Hillary Clinton is not."

"He is blunt, direct, and strong," she said. "He speaks his mind, and his heart."

"And when it comes to the threat posed by radical Islamic terrorism, he will not hesitate to kill the terrorists who threaten American lives," she said. "He will make America stronger, not weaker. This entire campaign comes down to a single question."

"If Hillary Clinton... can't give us the truth... why should we give her the presidency?" she asked.

After spotting a "Hilary for prison" sign in the audience, she said, "That's right, Hillary for prison, she deserves to be in stripes," she added to applause.

The attack on the diplomatic compound took place less than two months before President Obama's re-election. Many critics charged that administration's decision to blame the raid on a spontaneous reaction to an anti-Muslim video was engineered to prevent more political fallout in the final stage of the presidential contest.

The statements from Smith amplify earlier comments she's made in the months and years after the attacks. She has repeatedly taken Clinton, President Obama and other administration officials to task for failing to evacuate Americans from the compound and blaming the raid on the video.

Smith's remarks at the convention came just weeks after the House Select Committee on Benghazi delivered its highly anticipated final report. Documents and testimony the panel uncovered suggest Clinton knew within hours of the attack that the raid was planned and executed by members of Ansar al-Sharia, a terrorist group based in Libya, and not a video.

Republicans have long blasted Clinton for asking "what difference does it make" for Congress to investigate the cause of the attack and how the Obama administration responded to them. Since the release of the GOP congressional report, Clinton has said it has raised no new evidence of wrongdoing and has argued it's time to move on.

Smith is one of several speakers Monday night with ties to the attacks on Sept. 11, 2012 that left four Americans dead, including U.S. Ambassador Chris Stevens.

U.S. Marine Corps veterans Mark "Oz" Geist and John Tiegen, who fought in Benghazi as part of a security team posted at the CIA annex near the U.S. diplomatic compound, spoke after Smith. Tiegen co-authored the book "13 Hours," an account of the attacks that later was made into a movie.