Mammele – you are correct that it is better not to speak LH about anyone even “ainam Yehudim”, even though it is not technically assur, and it is something I generally try to avoid. I am impressed that that is something you realize and are concerned about.
However, in this case, the shikul I made was that LH was being spoken about Ivanka and Jared about whom LH is assur. Since one is a chumra and the other is a halacha, halacha takes priority.
I am unaware of any halachos regarding LH and presidents. I do agree that it is wise to be careful. However, again, halacha takes priority over all other considerations.