I think it's both. The GOP wants to dismantle the govt, other than the military, and Trump will gladly help them do it, because Obama. Dovetail fit.Their track record is blind stupidity towards budget reductions.
I see no evidence of motive for this particular case. Do you?
Absent an actual reason, I'll stick with it being typical hack and slash.
Hell, I'd love to see someone try to explain this Budget item in the oval office. Just bring me the coloring book they used to explain it, and I'll concede.