Homelessness is a very complex issue encompassing things like mental health and climate change. The president has no direct control over rent prices, they may be able to influence them to a degree, but that’s all. This is an integral part of late-stage capitalism. People in need are being left behind because America is filled with greed. One of the many things to help alleviate this would be the construction of subsidized dense housing in areas with high levels of amenities.