It goes to his presidential library for the use of its staff after his presidency. He won't technically own it, but he'll be able to use its value indirectly. It's definitely flouting bribery laws and daring anyone to do something about it.
Oh, don't be so dramatic. We're nowhere near that yet. We're just rapidly spiraling toward it like a disoriented skydiver tangled in the lines of their reserve chute.
That's some 5D, non-euclidean chess right there. Start a charity that only pays out to ICE veterans who make less than the standard retirement amount, so it only covers those who are unable or unwilling to do the job. Restrict the posters to photos and names only so it's clear that the charity isn't soliciting hostile action against ICE agents but still gives potential victims enough information to evade most assaults. The "Blue Lives Matter" mob probably wouldn't touch it with a ten-foot pole. Even if they do, the resultant infighting will still distract from their potential targets.
"For just a dollar a day, you can save this ICE agent, John Smith, and his family from a life of poverty if he ever leaves. He gave everything. Please just give something."
[Cue Sarah Mclaughlin] "In the arms of the angel..."
Hantaviruses, yes.