Minn. Stat. § 3.95: SPECIAL SESSION IN EVENT OF ATTACK.

In the event of an attack, if the legislature is not in session, the governor shall convene a special session as soon as practicable, but within 30 days after the inception of the attack. If the governor fails to issue the call, the legislature, on the first Tuesday after the first Monday more than 30 days after the inception of the attack, shall convene without call at the place where the governor then maintains official office.