When the commissioner deems it prudent, for the protection of the policy or certificate holders in this state, he may visit and examine, or cause to be visited and examined by a competent person appointed by him for that purpose, any such foreign assessment insurance corporation or association applying for admission or doing business in this state. The necessary expense of the examination made or ordered by the commissioner shall be certified to by him and paid by the corporation or association examined.
N.J.S. § 17:35-20