The President shall issue, and may alter and amend, such regulations as may be necessary for the guidance of personnel carrying out Federal assistance functions at the site of a major disaster or emergency. Such regulations shall include provisions for insuring that the distribution of supplies, the processing of applications, and other relief and assistance activities shall be accomplished in an equitable and impartial manner, without discrimination on the grounds of race, color, religion, nationality, sex, age, disability, English proficiency, or economic status.