Getty Images/AP
Now playing
03:16
Debate gets heated over candidate's past
senator bill nelson 11132018
CNN
senator bill nelson 11132018
Now playing
02:03
Nelson: Scott should recuse himself
Rep. Marsha Blackburn, R-Tenn., speaks to supporters after she was declared the winner over former Gov. Phil Bredesen in their race for the U.S. Senate Tuesday, Nov. 6, 2018, in Franklin, Tenn. (AP Photo/Mark Humphrey)
Mark Humphrey/AP
Rep. Marsha Blackburn, R-Tenn., speaks to supporters after she was declared the winner over former Gov. Phil Bredesen in their race for the U.S. Senate Tuesday, Nov. 6, 2018, in Franklin, Tenn. (AP Photo/Mark Humphrey)
Now playing
01:26
Meet the Republicans who held onto the Senate (2018)
Democratic congressional candidate Ilhan Omar is greeted by her husband's mother after appearing at her midterm election night party in Minneapolis, Minnesota, U.S. November 6, 2018. REUTERS/Eric Miller
Eric Miller/Reuters
Democratic congressional candidate Ilhan Omar is greeted by her husband's mother after appearing at her midterm election night party in Minneapolis, Minnesota, U.S. November 6, 2018. REUTERS/Eric Miller
Now playing
01:33
Minorities, LGBT make history in 2018 midterms
WJLA
Now playing
02:01
Hear from the Democrats who took back the House
CNN
Now playing
01:50
Abrams vows to remain in gubernatorial race
Spectrum News NY1
Now playing
02:05
Ocasio-Cortez: This is a movement for justice
KXAN
Now playing
02:07
O'Rourke congratulates Cruz on his victory
CNN
Now playing
01:57
Tapper: This is not a blue wave
CNN
Now playing
02:11
Van Jones: It's a rainbow wave
LAS VEGAS, NV - OCTOBER 20:  U.S. Rep. and U.S. Senate candidate Jacky Rosen (D-NV) speaks during a rally at the Culinary Workers Union Hall Local 226 featuring former U.S. Vice President Joe Biden on October 20, 2018 in Las Vegas, Nevada. Early voting for the midterm elections in Nevada begins today. (Photo by Ethan Miller/Getty Images)
Ethan Miller/Getty Images
LAS VEGAS, NV - OCTOBER 20: U.S. Rep. and U.S. Senate candidate Jacky Rosen (D-NV) speaks during a rally at the Culinary Workers Union Hall Local 226 featuring former U.S. Vice President Joe Biden on October 20, 2018 in Las Vegas, Nevada. Early voting for the midterm elections in Nevada begins today. (Photo by Ethan Miller/Getty Images)
Now playing
01:45
CNN projects Jacky Rosen elected to US Senate
Additional Embargo:   Additional Source(s):    Date Shot: 11/6/2018   Shipping/Billing Info:     Description: Projects: None  Cost Center: Atlanta National Desk / 20100101   Created By: DHackett  On: 1541544461  --------------------------------------------------------------------------------
WSB;
Additional Embargo: Additional Source(s): Date Shot: 11/6/2018 Shipping/Billing Info: Description: Projects: None Cost Center: Atlanta National Desk / 20100101 Created By: DHackett On: 1541544461 --------------------------------------------------------------------------------
Now playing
00:59
Brian Kemp: Confident victory is near
2018 Elections Primary Clean path
CNN
2018 Elections Primary Clean path
Now playing
01:49
Pelosi: Tomorrow will be a new day in America
CNN
Now playing
01:36
The Democrats who might lead the House
CNN
Now playing
01:54
DeSantis thanks Trump in victory speech
KXAN
Now playing
01:44
Cruz: This election was a battle of ideas
(CNN) —  

Republican Rep. Martha McSally demanded an apology on Monday night from her Democratic opponent, Rep. Kyrsten Sinema, at a debate in Arizona for what she called “treason,” seizing on an element of a CNN report that details the Democrat’s anti-war activist past.

CNN’s KFile reported that in 2003, Sinema told a local radio host when he posed a hypothetical about an individual making the personal decision to join the Taliban army, “Fine, I don’t care if you want to do that, go ahead.”

At the debate Monday night, McSally offered her interpretation of Sinema’s comments to attack her, saying, “you said it was OK for Americans to join the Taliban to fight against us.”

“You said you had no problem with that. Kyrsten, I want to ask right now whether you’re going to apologize to the veterans and me for saying it’s OK to commit treason.”

McSally was citing the CNN KFile report that details Sinema’s extensive past as a progressive activist and how her views on foreign policy and military involvement have evolved.

Sinema appeared on the radio show of local libertarian activist Ernest Hancock in 2003. Sinema and Hancock discussed their political views, with Hancock taking up the libertarian argument against intervention and raising as a hypothetical against Sinema’s worldview if she would oppose him joining the Taliban army.

“Now you would say, maybe we do owe something to the world, as long as it’s nice and sweet and peaceful and what you want to do,” Hancock said to Sinema on his show, “Declare Your Independence with Ernest Hancock.”

“Well it’s not so much a candy cane kind of theory as you’re making it stand out,” Sinema responded. “But I do think that those of us who are privileged to have more do owe something to others.”

“By force?” Hancock asked. “By me, as an individual, if I want to go fight in the Taliban army, I go over there and I’m fighting for the Taliban. I’m saying that’s a personal decision…”

“Fine,” Sinema interjected, “I don’t care if you want to do that, go ahead.”

After Hancock listed off other hypotheticals, Sinema then said she’d like to get back on topic to her opposition to the Iraq War.

“I don’t want to debate any kind of, I don’t know, fiscal opportunities with you,” Sinema said. “I’m interested in talking about the war. Specifically I’m interested in talking about opposition to the war that’s happening tomorrow.”

Helen Hare, a spokeswoman for the Sinema campaign, told CNN that Sinema’s comment on Hancock’s program was “clearly offhand and an effort to get back on the topic of why she opposed the war.”

At Monday’s debate, Sinema responded to McSally by saying, “Well, Martha has chosen to run a campaign like the one you’re seeing right now where she’s engaging in ridiculous attacks and smearing my campaign.”

“And she’s just trying to cut, cut, cut and not share the full picture,” Sinema said. “But the truth is that I’ve always fought for Arizona and I have been proud to serve our state and elected office for over 13 years. Arizonans know me and they know my record.”

Sinema later told reporters McSally’s attack was “ridiculous,” Hare told CNN Tuesday. McSally’s campaign has not responded to CNN’s request for comment about Monday night’s debate.

Since joining Congress, Sinema has a more moderate political image. She voted against approving the Iran deal and, this past April, backed President Donald Trump’s decision to strike Syria. In 2015, she voted with Republicans to stop admitting Syrian and Iraqi refugees until the vetting process was strengthened.

CNN’s Andrew Kaczynski and Chris Massie contributed to this report.