Tanning beds that use light don’t make you orange, they make you tan or burnt.
Fake tan can make you orange, some drugs can make you orange, bad foundation color can make you orange. Some days he isn’t orange.
My guess is he uses a fake tan that is too orange, but I don’t know that for sure. Peach undertones in the skin are very common in very pale skin, I tend to be on the peachy side. Back in the day the make-up line Prescriptives would make foundation that matched your skin, and they classified people with orange, pink, yellow, there might have been other colors too, undertones.
My guess, and I’m just guessing, is Trump thinks he looks good, just like tanarexics think they look good with their really dark, leathered, aged, skin. That group I sometimes say something to, because they possibly are killling themselves. If someone uses bad self-tanner, I don’t really care.
Make-up artists can easily change his skin tone even if he is orange from medication or some sort of condition, but it doesn’t seem he opts to do that.
More recently he rarely looks orange to me.