"The View" co-host Meghan McCain Meghan Marguerite McCainKasich to Meghan McCain: Concern over abortion 'dwarfed' by need to beat Trump Meghan McCain says she believes report Trump called fallen soldiers 'losers' Meghan McCain hits Ivanka Trump's defense of president's Twitter: It's not a 'communication style,' it's 'cruelty' MORE and Sen. Cory Booker Cory Anthony BookerThe movement to reform animal agriculture has reached a tipping point Watchdog confirms State Dept. canceled award for journalist who criticized Trump 3 reasons why Biden is misreading the politics of court packing MORE (D-N.J), a 2020 White House hopeful, had a heated exchange on Wednesday after she called a gun buyback program "crazy" and "a left-wing fever dream."

“When I heard you and Beto say that, to me, that’s like a left-wing fever dream,” McCain said to Booker on Wednesday, referring to another Democratic presidential candidate, former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas). “And I want to know how you think you and Beto are going to go to red states and go to my brother’s house and get his AR-15s because, let me tell you, he’s not giving it back.”

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Booker replied that his plan is not as aggressive as O’Rourke's, which prompted McCain to reply, “Good! Because he’s crazy!”

“We should watch the way we talk about each other,” Booker cautioned. "Seriously, we can’t tear the character of people down. We have different beliefs.”

In an exchange with @MeghanMcCain, Cory Booker pushes back against McCain's criticism of Beto O'Rourke and explains his support for mandatory assault weapon buybacks: "Other countries have done it. We did it with machine guns" https://t.co/gDKtp7VYF4 pic.twitter.com/yrLaNnDEGS — ABC News Politics (@ABCPolitics) October 30, 2019

McCain, who has had a running feud with O’Rourke in recent months, replied by stating the former Texas congressman “has no problem doing it to me.”

“He was very nasty to me about this,” she added.

“You and I both know that just because somebody does something to us, doesn’t mean we show the same thing back to them,” Booker replied.

“I’m not running for president, with all due respect,” McCain retorted. “And the way he talks about me inciting violence on this, I take very seriously and I speak for a lot of red state Americans whether he likes it or you like it or not, there’s a lot of Republicans you have to win over.”

The conversation eventually shifted to how Booker would execute his buyback plan, which McCain said her brother, a gun owner, would not abide by.

“So you’re going to go to my brother’s house?” she said. “My brother won’t do it.”

“Why are we playing into fear-mongers that want to give this vision that people are going to show up at your house taking your guns away?” Booker said while adding that buybacks have worked before.

The back-and-forth comes as Booker and O'Rourke have proposed buyback programs for certain types of guns, drawing criticism from Republicans and other Democratic candidates including South Bend, Ind. Mayor Pete Buttigieg Pete ButtigiegBillionaire who donated to Trump in 2016 donates to Biden The Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November Buttigieg stands in as Pence for Harris's debate practice MORE.

Booker is currently polling at 1.6 percent in the RealClearPolitics index of polls for the 2020 Democratic nomination.