The problem with American foreign aid is that it is currently being embezzled by institutions and criminals with no fealty to helping the people and societies toward which we target our generosity, and thus there is no ROI in American security and prosperity, or our God-ordained obligation to humanity. Foreign aid, as operated by the UN and the International mobsters, is being used in direct contravention to our interests.
If the AIDS program bypasses these criminal conspiracies, that's a win for humanity and for America's security. A program of this moral priority is untouchable, no despot or corrupt bureaucracy can interfere, and the power of despots and corrupt international bureaucracies will be eroded. That's a win-win.
My rights come from God. I choose which rights and prerogatives that I cede to my political institutions and leaders. If I think foreign aid is a good strategy to enhance my safety and security, and that of my tribe - I'll enable my Reps to use our American process to make it happen. When I think foreign aid is no longer a tool to promote my individual or group benefit, I'll work to yank it through the same process. The Constitution is primarily about the processes, consensus and safeguards to ensure MY individual political priorities have widespread support and wisdom. This AIDS initiative will have overwhelming American support, and if it is designed, funded, judicially reviewed in a Constitutionally legitimate way and executed in a logistically ethical and effective way, it'll be Constitutional on its face. The debate whether the initiative is good policy and maximizes American long-term interest is another debate entirely, and one worth having. There is no inherent Constitutional issue here.