The event was attended by hundreds of gang members.
Previous incidents at gang processions have put "the wider community at risk".
"I am not interested in meeting with people who deal with meth," the National MP replied
Police say charges are likely following the discovery of a 3D-printed gun at a man's house in Auckland.
But Jarrod Gilbert says the operation will have a long-term effect by preventing organised crime from building an asset base.
Marama Davidson has also corrected the record about her visits to the mob.
Nicole McKee met with a Mongrel Mob representative after complimenting their work in a select committee.
One person said it was run by a bunch of buffoons.
One meeting was a hui with the Mongrel Mob Kingdom.