(CNN) - Responding to questions about his relationship with Charles and David Koch–better known as the Koch brothers-Herman Cain on Friday stood by his friendship with the influential conservative duo.
"I am the Koch brother's brother from another mother," the GOP presidential hopeful said to much fanfare at a summit hosted by Americans for Prosperity in Washington, D.C.
Americans for Prosperity, which supports many tea party movement causes and which also pushes for reducing government regulation in the oil and gas industries, was co-founded by the pair of industrialists. The Koch brothers are major supporters of conservative and libertarian causes.
A New York Times report earlier Friday outlined close financial and political ties between Cain and the Koch brothers, pointing out that some critics on the left view Cain as "in effect a mouthpiece for the corporate interests" of the brothers' empire.
But Cain added his own input to the article Friday, saying he took pride in their relationship.
"I'm their brother from another mother," Cain repeated. "And proud of it!"