50 U.S. Code § 1641 - Accountability and reporting requirements of President
When the President declares a national emergency, or Congress declares war, the President shall be responsible for maintaining a file and index of all significant orders of the President, including Executive orders and proclamations, and each Executive agency shall maintain a file and index of all rules and regulations, issued during such emergency or war issued pursuant to such declarations.
All such significant orders of the President, including Executive orders, and such rules and regulations shall be transmitted to the Congress promptly under means to assure confidentiality where appropriate.
When the President declares a national emergency or Congress declares war, the President shall transmit to Congress, within ninety days after the end of each six-month period after such declaration, a report on the total expenditures incurred by the United States Government during such six-month period which are directly attributable to the exercise of powers and authorities conferred by such declaration. Not later than ninety days after the termination of each such emergency or war, the President shall transmit a final report on all such expenditures.