Two of the reasons Trump is "one of the greatest embarrassments in USA's history"?  He is being clobbered by the people he routinely rants about (in Phoenix and elsewhere): the media, and "leakers" in and around the Whitehouse. 

Many of us find fault with media--our right; in fact, our duty. But exposure is non-stop, reaching more people  than ever and--this is important--while it's happening. Bias? Sure, and some of the most biased "reporting"--really editorializing--is the on-line 21st century version of "yellow journalism." However...

Have other Presidents approached his level of craziness? Quite possibly. Polk might have: when Mexico refused to sell Nevada, Arizona and parts of Utah to the US, Polk just created a war. After Mexico surrendered US paid a pittance for the territory. Wild stuff. Most people never realized it at the time; most never saw a (biased) daily newspaper and many couldn't read what was in it.  No TV, radio, on-line back then.  Who knows the level of craziness