Former Rep. Adam Kinzinger is delivering a prime-time speech in support of Harris -- rounding out a slate of Republicans who have spoken at the DNC this week, including former Georgia Lt. Gov. Geoff Duncan, Mayor John Giles of Mesa, Arizona, former Trump White House national security official Olivia Troye and former Trump White House press secretary Stephanie Grisham.

Kinzinger, who retired from the House in 2023, has been a vocal Trump critic over the years, and although he describes himself as a "proud conservative," he endorsed then-candidate Joe Biden for reelection in June.

The former Illinois congressman sat on the House's Jan. 6 select committee that investigated the attack. He was also one of the 10 House Republicans who voted to impeach Trump on a charge of inciting the Jan. 6 attack.

Since Harris replaced Biden as the Democratic nominee, Kinzinger has supported the vice president, saying she stands for democracy.

-ABC News' Sarah Beth Hensley

Arizona Democratic U.S. Senate candidate Ruben Gallego talked about veterans issues in his remarks, claiming “Kamala Harris has delivered more benefits to more veterans than ever before, and has achieved the lowest veterans unemployment rate in history.”

Leaving aside what Harris did specifically to lower unemployment for veterans, the numbers show that the unemployment rate for veterans in 2023 dropped to 3%, the lowest average the Bureau of Labor Statistics recorded since it began tracking the veterans data in 2000.

—PolitiFact’s Aaron Sharockman

Michigan Gov. Gretchen Whitmer, or as she introduced herself "Big Gretch" got a huge ovation as she took the stage and immediately took a jab at Trump.

"Donald Trump called me 'that woman from Michigan' as an insult. But being a woman from Michigan is a badge of honor. Like women across America, we just G.S.D. -- Get Stuff Done," using the sanitized version of the slogan.

Whitmer talked about the struggles of raising her child and helping her elderly mother. The governor noted that Harris has lived a similar life, unlike Trump

"You think he understands that when your car breaks down you can’t get to work? No! His first word was probably 'chauffeur,'" she said.

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Gretchen Whitmer calls Harris a ‘total bad---’ during full DNC speech

Speaking of the Democratic presidential candidate, the Michigan governor said, “She’s lived a life like ours. She knows us.”

Whitmer acknowledged the last couple of years have been hard but in the end they need to make sure the commander in chief is ready for any crisis like Harris.

"Why wouldn’t we choose the leader who’s tough, tested and a total bada--?" she said to cheers.

While making the case for Harris as commander-in-chief, Leon Panetta, the Secretary of Defense under former President Barack Obama, said Trump will "abandon our allies and isolate America."

"Listen to President Reagan," Panetta said. "Isolationism never was and never will be an acceptable response to tyrannical governments."

In drawing a comparison between the two candidates, he said, "Trump tells tyrants like Putin they can do whatever the hell they want. Kamala Harris tells tyrants the hell you can. Not on my watch."

He drew the largest applause when he said that the role of the U.S. military is to defend us from foreign enemies and "sure as hell isn't to put immigrants in camps."