You know when you were a kid and your parent pressed the tip of your shoe to make sure they couldn't feel your toes so that your shoe had room to grow?
The tips of his shoe look so empty because there's a hidden heel inside of the boot to give him some extra height so Trump doesn't make fun of him for being short.
Dark brown or black shoes are really the only acceptable shoes to wear with a blue suit; any other colors look garish and should not even be considered.