From The Daily Beast:

...It’s not just a question of nuclear codes, it’s everything about him, the casual lies, the open racism, you name it. Just read Jane Mayer’s brutal article that landed today based on her interviews with Tony Schwartz, who ghost-wrote The Art of the Deal and who believes now that Trump is a totally amoral sociopath.[Later: Trump threatens Schwartz with legal action]

It used to be, back in more civil times, that the other side kind of went dark during one party’s convention. No one can afford that luxury now. Americans who watch the GOP fest are going to hear four nights of “Hillary has blood on her hands” and “Hillary belongs in jail.” 

The Clinton campaign should devote some energy this week not to pushing back against those narratives directly necessarily, but to reminding Americans that the other guy is unacceptable on every level...

See also 141 Things Donald Trump Has Said and Done That Make Him Unfit to Be President

Later: I just read the Jane Mayer New Yorker story linked above. It's the best thing I've read about Trump, and I'm sorry to say I've read a lot. Needless to say it's not flattering.