There, fixed it for you.
I generally don’t use office titles, outside military ranks, in my personal writing. Political leaders are citizens, equal under the law to me and everyone else.
Remember about 10-12 years ago when then California Senator Barbara Boxer had a snit fit during a hearing when she was called “Ma’am” instead of “Senator”? I believe Mr. Trump recognizes he is just a citizen, albeit one with a tough, thankless, public job, and would not be offended by a polite “Mister” or “Sir.”