Defence Minister Mohamad Sabu says that former premier Najib Abdul Razak is "not a gentleman" for criticising him outside the Dewan Rakyat.

"I don't want to respond to comments made outside, I want to answer in the Parliament. Commenting outside is like hitting below the belt.

"Not gentlemanly, come comment in here (the Dewan Rakyat)," he told reporters at the Parliament lobby today...