President Biden announces additional disaster assistance for Ponca Tribe of Nebraska Susan Walsh/AP and last updated 2021-07-21 17:05:24-04 WASHINGTON (KMTV) - President Joe Biden announced additional disaster assistance available to the Ponca Tribe of Nebraska on Wednesday. Biden is authorizing an increase in the level of federal funding for Public Assistance projects undertaken as a result of severe storms and flooding during the period of March 13 to April 1, 2019.