Rep. Ruben Gallego, an Iraq war veteran, brought on stage Democratic veterans serving their county and in elected offices at every level.

"These veterans represent the best of our country," he said. "We stand united as veterans, Democrats and patriots to fight for everyone who serves."

"But politicians like Donald Trump. They don't stand with us," he said. "They call patriots like Sen. McCain 'losers.' John McCain was an American hero. Show some respect."

Gallego is running for Senate in Arizona against Trump-ally Kari Lake.

The vice president’s motorcade arrived at the United Center at 9:48 p.m. ET, according to the press pool.

Another sign of how Democrats are trying to turn patriotism and national security arguments on their head, is the prime-time speaking spot for Leon Panetta -- telling the story about giving the order that led to the death of Osama bin Laden.

6:27

Leon Panetta warns of ‘moment of danger’ during full speech at the DNC

The former U.S. Secretary of Defense said, “We need Kamala Harris behind the resolute desk.”

-ABC News' Rick Klein

Trump was not known to look through the Presidential Daily Brief regularly or read it to completion. He relied instead on oral briefings that he received from intelligence officials every few days.

Former National Security Adviser John Bolton wrote in his memoir that "Trump generally had only two intelligence briefings per week, and in most of those, he spoke at greater length than the briefers, often on matters completely unrelated to the subjects at hand."

—PolitiFact's Aaron Sharockman