Sen. Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (D-Minn.) and former South Bend, Ind., mayor Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE (D) battled each other Wednesday night over Klobuchar's vote to confirm Kevin McAleenan, former head of Customs and Border Protection (CBP0.

Late into Wednesday's Democratic primary debate in Las Vegas, Klobuchar came under fire from Buttigieg for her vote to confirm McAleenan, who went on to become President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's acting Homeland Security secretary before his resignation last year.

"If you're going to run on your record in Washington, then you've got to own those votes, especially when it comes to immigration," Buttigieg told the senator. "You voted to confirm the head of Customs and Border Protection under Trump, who is one of the architects of the family separation policy.

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"You voted to make English the national language," he added. "Do you know what message that sends in as multilingual a state as Nevada to immigrants?"

Buttigieg finished his remarks with a message in Spanish before Klobuchar fired back: "I wish everyone was as perfect as you, Pete. But let me tell you what it's like to be in the arena."

Klobuchar then corrected Buttigieg's statement about the number of judges nominated by Trump for whom she had voted, though her defense of her record was contested by the liberal judicial activist group WeDemandJustice on Twitter, and responded to his remark about McAleenan: "The things that you are referring to, that official that you are referring to, was supported by about half the Democrats, including someone in this room. And I will say this: he was highly recommended by the Obama officials."

WATCH: Sen. Klobuchar to Buttigieg: "I wish everyone were as perfect as you, Pete. But let me tell you what it's like to be in the arena."

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Buttigieg responds: “You don’t have to be on Capitol Hill for your work to be significant.” pic.twitter.com/bM80LcUzl0 — MSNBC (@MSNBC) February 20, 2020

The exchange marked the end of a night of fierce confrontations between the two moderate candidates, and occurred minutes after a fiery clash between the two during which Klobuchar questioned whether the 38-year-old former mayor was doubting her intelligence.

The two candidates are both battling to increase their share of nonwhite voters in the face of polling showing them at a disadvantage among such voters compared with candidates such as Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) and former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE.