project, or activity for which Congress, on or after the date of the events giving rise to the emergency declaration, has withheld authorization or funding. 202. Effective periods of national emergencies (a) Temporary effective periods (1) In general A declaration of a national emergency under subsection (a) shall be effective for 30 days beginning on the day after the date of the issuance of the proclamation and shall terminate when that 30-day period expires unless there is enacted into law a joint resolution of approval under section 203 with respect to the proclamation. (2) Exercise of powers and authorities (A) Exercise pursuant to proclamation Subject to section 201(e), any emergency power or authority made available under a provision of law specified pursuant to section 201(b)(1) may be exercised pursuant to a declaration of a national emergency upon the issuance of the proclamation. That power or authority may not be exercised on or after the 30-day period described in paragraph (1) unless there is enacted into law a joint resolution of approval under section 203 approving— (i) the proclamation of the national emergency