"This is a fragile man and a fragile campaign," the independent candidate said.
A report found stark divisions in educational achievement between different regions of the country.
"I don't want to talk about that," Trump says.
The two are expected to discuss the possibility of a WikiLeaks “October surprise.”
The campaign called it "pretty egregious to knowingly allow a falsehood to remain posted."
Obama offered support for ally after deadly quake in central Italy.
Professors argued that guns on campus would restrict free speech.
"It is time to enact prescription drug policies that work for everyone," Sanders tweeted.
"The Clinton Foundation does a lot of good work," Kellyanne Conway said.
Hillary Clinton was not the ratings draw ABC and Jimmy Kimmel were hoping for.