He responded to a commentator who called National's proposal "garbagy brain-fart".
It says the law unfairly discriminates against gangs and therefore Māori.
It's part of his plan to "wipe them off the face of the earth".
But he won't say how many specialist police officers will be needed.
He says it's a "known fact" that prisons are a "breeding ground for gangs".
"They do go for the little sound bites rather than well-thought-out policy."
"National isn't fooled by gang PR campaigns."
It was one of several gang-related incidents in the city last Sunday.
Gang leaders say they're trying to confront problems members face - and cause.
There are fears this is leading to an explosion of violence.
The incident broke out while the men were in custody.
Lucy Sandford-Reed sighed when she heard National's latest proposals.
"He's just politicking, he doesn't have the numbers... it's all hot air."
National's also proposing a time limit on the dole for people under 25.
He won't stop gang members accessing healthcare but will cut their dole.
They will have to prove they aren't making money illegally if they want to receive a benefit.
It's reported he also swallowed glass in the attack.
"There is a connection between poverty and where people end up."
The Government is vowing to boost resources to fight gang crime.
Nearly $1 million in assets has been seized in the drug raids.