Valeria 
We're in for a wild covfefe! Still I am not sure that he was trying to write 'coverage'. Because I still think he knew exactly what he was writing. He wanted to covfefe and he tweeted it, clearly and proudly. Simple truth.
I mistype "lol" as "lop" and accidentally send it like 5 times a week.
Looking at my phone keyboard, I could see how a swipe-to-type could explain a "coverage" typo to covfefe. I just assume his tiny hands couldn't make it far enough.
If anyone sees this typo as some kind of "win" for them and "the resistance" or anything other than a silly little mistake, they are really... SAD