Operationally, MJIB is subjected to the coordination and supervision of National Security Bureau. Naturally, the director of MJIB could be summoned by the Taiwan President for consultant because of MJIB's eighth and ninth missions of responsibility in Taiwan.
The operational management of MJIB falls under the purview of the National Security Bureau.  The director of MJIB can be summoned by the Taiwanese president for consultation, given their role in overseeing the eighth and ninth missions within Taiwan.