However, he announced in May that he was resigning amidst allegations of "bullying" within the party.
Kaushal is also president of the Crime Prevention Group, a community action group formed in March following a spate of aggravated robberies against dairy stores and small businesses.
"On the most concerning to the community, particularly law, order and immigration, that I have been proactively voicing for the community, the National Government has come forward listening to the community when needed," he said.
"It has taken prompt actions on it and shown genuine commitment to the community."
Kaushal said he accepted National's invitation following consultation with leaders and members of the community.
But Kaushal said he would not be seeking to stand as a candidate for National.
"I will be playing a significant role in mobilising and consolidating the Indian vote," he said.
National has yet to announce its list for the 2017 elections.