tinyE: Actually first it was Michelle Obama.
And Trump criticized her for it:
“Many people are saying it was wonderful that Mrs. Obama refusing to wear a scarf in Saudi Arabia, but they were insulted. We have enuf enemies”
https://www.thestar.com/news/world/2015/01/28/michelle-obama-forgoes-headscarf-in-saudi-arabia-twitter-is-aghast.html Yes, but she makes a habit of wearing headscarfs elsewhere, like in Indonesia for example... So that doesn't count, i think?
https://www.thestar.com/content/dam/thestar/uploads/2015/1/28/obama-in-indonesia.jpg Here we are talking about straightforward, honest women, who never wear such women-degrading garbs in their entire life and neither they ever would. Not about shady "actors" with double life and all that stuff...
About Trump you are correct, though; but nothing wrong with that. Especially since the receiver of criticism wasn't very honest and all (did that for image/display, not out of values/mindset), in the first place. Nothing wrong with grabbing every chance to "hit" your political opponents, either; i gather everyone attacks Trump anyway, even on the correct things he does (or tries to).
But let's for once put aside our differences and find common ground to abridge the gaps between us! Women slowly and steadily getting freedom inside muslim world is something wonderful! Even if it is but a small step, only for a priviledged few ones, for a start.