The President and Legislature are elected at the federal level. All the various major executive branch figures below that are appointed by the President, and at best require the Senate to approve them. Most aren't as ridiculous in their picks as Trump, but he's a narcissistic megalomaniacal buffoon so he has to ensure to himself that's he's surrounded with people who are well known and popular (hence why he seems to be mostly picking based on media experience rather than anything pertinent, save a couple of Project 2025 authors and Tulsi Gabbard) but that he can see himself as above and will stroke his ego by affirming that.