under the Insurrection Act (a) In general Chapter 13 of title 10, United States Code, as amended by section 5, is further amended by adding at the end the following new section: 257. Termination of authority and expedited procedures for extension by joint resolution of Congress (a) Definitions In this section: (1) 14-day period With respect to an invocation of authority under section 251, 252, or 253, the term 14-day period means, as applicable— (A) in the case of an invocation of authority on a date on which Congress is in session, the period beginning on the date on which the President invokes such authority and ending on the date that is 14 calendar days after the date of such invocation