As tenured posters know, I’m very pro-Trump. However, we shouldn’t let politics get in the way of halachah. At the very least, what they did is identical to something which is assur, which makes it definitively a chillul Hashem. What DY is saying is 100% right. I don’t think there’s any real proof the Kushners even asked anyone, much less a trustworthy Orthodox rabbi.
It reminds me of the joke where we say, how do we know Moshe Rabbeinu covered his head? Because the Torah says Moshe went out… Of course he didn’t go out with an uncovered head! I.e. How do we know the Kushners got a pikuach nefesh heter? Because we know they got driven to a Church on Shabbos… Of course they didn’t do so without a heter! Obviously, in practice, this logic does not apply.