The President shall identify in the annual budget request submitted to Congress under section
1105 of title
31 all funds necessary to fully fund all funding agreements authorized under this part, including funds specifically identified to fund tribal base budgets. All funds so appropriated shall be apportioned to the Indian Health Service. Such funds shall be provided to the Office of Tribal Self-Governance which shall be responsible for distribution of all funds provided under section
458aaa–4 of this title.