An expected part of Project 2025[1]. The end goal is to install Trump allies as heads of every agency that matters to their agenda, and to shut down all agencies that don't. This way by end of 2028 there is nobody left in government who can speak out against what they're going to do next.
If you have not read Project 2025 in a while, I encourage you to revisit it[2]. In summary it's a point-by-point plan to take over the entire federal government in order to enforce a single political ideology and suppress dissent. You can track[3] it as it gets implemented.