Democratic presidential rivals went after New York City Mayor Bill de Blasio Bill de BlasioOVERNIGHT ENERGY: California seeks to sell only electric cars by 2035 | EPA threatens to close New York City office after Trump threats to 'anarchist' cities | House energy package sparks criticism from left and right EPA threatens to close New York City office after Trump threats to 'anarchist' cities New Year's Eve in Times Square to be largely virtual amid pandemic MORE (D) on Wednesday night for not firing Officer Daniel Pantaleo for the death of Eric Garner.

“He knew what he was doing. He was killing Eric Garner and he has not been brought to justice,” Julián Castro, who served as Housing and Urban Development secretary during the Obama administration, said during Wednesday's debate in Detroit. “That police officer should be off the streets.”

De Blasio responded by placing blame on the Justice Department, suggesting he was told to hold off on penalizing Pantaleo while federal authorities were pursuing their case.

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The Justice Department ultimately decided against bringing federal civil rights charges against Pantaleo, who was seen on video wrapping his arms around Garner’s neck and holding him down in 2014. Garner's last words, "I can't breath," became a rallying cry for those protesting use of force policies by police departments across the country.

Attorney General William Barr Bill BarrHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Bipartisan representatives demand answers on expired surveillance programs YouTube to battle mail-in voting misinformation with info panel on videos MORE ordered officials to drop the case earlier this month.

“I know the Garner family, they’ve gone through extraordinary pain,” de Blasio said. “They are waiting for justice and they’re going to get justice. They're going to finally get justice.”

De Blasio indicated there would be some kind of action in "30 days." He also said the New York City Police Department is “changing how we police.”

“There will never be another tragedy, there will never be another Eric Garner,” de Blasio said.

Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.), who said she met with Garner's mother, launched into criticism of de Blasio minutes later at the debate, echoing Castro by calling for the officer’s firing.

“He should be fired now,” Gillibrand said. “If I were the mayor, I would fire him.”