Assistant Attorney General John Carlin is departing October 15.
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He said Trump's behavior during the debate should alarm world leaders.
The network averaged 11.4 million viewers for Monday night's debate.
More than 80 million people viewed Monday's presidential debate.
The former 2016 candidate will be a guest instructor on education policy.
Trump has said he'll "100 percent" be at the debates despite speculation.
“I never met José Fernández, and yet I feel like I knew him," said Rubio of the Cuban-American pitcher.
The liberal filmmaker is warning Clinton supporters to not become complacent.
Trump reignited their old feud at the end of Monday's presidential debate.
Trump "just decided that we'll just make it clear" after media pressure, Pence said.