National security adviser Robert O'Brien revealed that U.S. forces named its mission to kill ISIS leader Abu Bakr al-Baghdadi after Kayla Mueller.

During an interview on Meet the Press, O’Brien explained that the mission was inspired by the urge to bring justice to Mueller and other Americans who had been brutalized by Baghdadi and his followers.

He revealed the mission that led to the death of Baghdadi was named after Mueller by General Mark Milley of the Joint Chiefs of Staff.

“We finally brought justice to a man that beheaded the three Americans: two journalists and a humanitarian worker,” said O’Brien, adding, “One of the things that General Milley did is General Milley named the operation, the chairman of the Joint Chiefs of Staff, named the operation that took down al-Baghdadi after Kayla Mueller.”

O’Brien said he believed that was “something that people should know.”

Mueller, 26, was an American Christian woman and human rights activist who was kidnapped by ISIS terrorists outside of a hospital in Aleppo on Aug. 4, 2013. Held hostage for 18 months, she was raped repeatedly by the ISIS leader. She refused to convert to Islam during her imprisonment, according to those who were with her and escaped, and even defended her faith to the vicious "Jihadi John." She was reportedly killed during coalition airstrikes in early 2015.

“Justice was brought to those Americans who were so brutally killed,” O’Brien explained.

During a press conference about Baghdadi’s death, President Trump claimed the ISIS leader was “whimpering and crying and screaming all the way” to his death. The president also said he died "like a dog."