UFC middleweight champion  Khamzat Chimaev captured the 185-pound championship at UFC 319 last August, utterly decimating former titleholder  Dricus Du Plessis .  Having not yet defended his belt, Chimaev is angling for a champion vs. champion mega fight against light heavyweight knockout artist  Alex Pereira . And “Borz” wants the super fight to take place at the UFC White House event in June.  “Let’s go White House.