There is a duty in the Catholic Church to avoid scandal. You can look it up in the Catechism. It's tied to the "love your neighbor" directive and of course those pesky Ten Commandments.
There's already plenty of turmoil within the Church. We're not supposed to wreak more havoc inside the faith. I can't argue against such a reasonable caveat.
Based on that concept, I'm don't have much to say about the current "war" of words between the president and the pope. I certainly do have my own opinions on the matter. But the only public comment I care to make at this point is: I wish both men would just sit down and shut up.
