Whoa...
Ok, why he never showed up is one question. Why he wasn’t replaced is another question.
As many have observed - we have either unimagonably incompetent Secret Service, OR a sloppy, poorly orchestrated attempt to assassinate President Trump, which included some inside security people (though how high up the chain it went is impossible for us to know).
Both scenarios are unthinkable.
Only if you've been living under a rock for the last several years.
If one pays any attention at all it reminds me of a covered pot on the stove gettin ready to boil over. It's too late for the wooden spoon trick to keep it calm. So either somebosy hasta remove the lid and blow on it while turning down the heat.
Or, we get a big mess that will require some "cleaning up".