Turns out, the United States did send $50 million for STD prevention to Gaza ($83 million to be exact).
Just so happens, it was sent to the province of Gaza in Mozambique, the country located on the southeastern coast of Africa. Hamas in Gaza, Palestine, did not receive $50 million worth of U.S. condoms from that grant, like President Trump suggested earlier today.
It took me some manual analysis because there is a misspelling in the award grant ("INGAZA"), but there does indeed appear to be a 83 million grant for STD prevention in Gaza.