The Trump administration is halting a $1 billion program that helps preserve affordable housing, threatening projects that keep tens of thousands of units livable for low-income Americans. Preserving these units gets less attention than ribbon-cuttings, but it’s a centerpiece of efforts to address the nation’s housing crisis. Hundreds of thousands of low-rent apartments, many of them aging and in need of urgent repair, are at risk of being yanked out from under poor Americans. On it’s face, the over $1 billion Green and Resilient Retrofit Program, passed by Congress in 2022, is intended for energy-efficiency improvements. It is distributed in...