A number of Democratic presidential hopefuls have come out to publicly condemn federal prosecutors' decision not to charge New York City police officer Daniel Pantaleo in the 2014 death of Eric Garner.

The 2020 candidates expressed sympathy for the Garner family and highlighted the underlying the issue of criminal justice reform in the U.S.

"This is a miscarriage of justice. Our criminal justice system should be rooted in accountability. My heart breaks for the Garner family," Sen. Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (D-Calif.), a former prosecutor, said in a tweet.

This is a miscarriage of justice. Our criminal justice system should be rooted in accountability. My heart breaks for the Garner family.https://t.co/qwSVbXdzSc — Kamala Harris (@KamalaHarris) July 16, 2019

Harris's fellow candidate and Senate colleague Sen. Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (D-N.J.), also took to Twitter to slam the decision, calling it a "reminder of just how broken" the U.S. criminal justice system is.

"This decision is wrong, unjust and painful reminder of just how broken our criminal justice system is. Eric Garner should be alive today. I pray his loved ones can find peace," he said.

This decision is wrong, unjust and painful reminder of just how broken our criminal justice system is. Eric Garner should be alive today. I pray his loved ones can find peace. https://t.co/WChz5ds334 — Cory Booker (@CoryBooker) July 16, 2019

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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, who is also running for president, slammed the Department of Justice and indicated there is now a strained relationship between the city and the department.

"Years ago, we put our faith in the federal government to act. We won't make that mistake again," de Blasio said in a statement. "Moving forward, we will not wait for the federal government to commence our own disciplinary proceedings."

Sen. Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.) joined her colleagues, calling the decision "an injustice."

This is an injustice. We have a responsibility to protect our citizens—and to hold police accountable when they fail. No one is safe in a country with a broken criminal justice system. My heart goes out to Eric Garner's family today. https://t.co/z6c6xaGn94 — Elizabeth Warren (@ewarren) July 16, 2019

Sen. Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) and philanthropist Tom Steyer Tom SteyerTV ads favored Biden 2-1 in past month Inslee calls Biden climate plan 'perfect for the moment' OVERNIGHT ENERGY: Trump administration finalizes plan to open up Alaska wildlife refuge to drilling | California finalizes fuel efficiency deal with five automakers, undercutting Trump | Democrats use vulnerable GOP senators to get rare win on environment MORE each took aim at the racial element of the decision, and called for reform.

The Garner family has suffered too much. This decision pains me. It is not just, and we will not have real justice for black Americans until there is serious reform of our racist criminal justice system. https://t.co/U3wZiXJDg1 — Bernie Sanders (@BernieSanders) July 16, 2019

Eric Garner was murdered in the street for the crime of being black. Police cannot be allowed to slaughter Americans in broad daylight. There must be consequences for police brutality. His life matters. Black lives matter. — Tom Steyer (@TomSteyer) July 16, 2019

Wednesday will mark the fifth anniversary of Garner's death, and would have been the deadline to file certain civil rights or criminal charges against Pantaleo. The officer placed Garner, an unarmed black man, in a headlock on July 17, 2014, while attempting to arrest him for selling untaxed cigarettes.

The decision has drawn newfound attention to the state of the criminal justice system in the U.S., which Democratic presidential hopefuls have addressed on the campaign trail. Many also have a career background in the field.

Harris implemented a series of criminal justice reform policies during her tenure as California attorney general, establishing a statewide body camera program. As a senator, Harris has also backed legislation to provide funding for body cameras.

Sanders has spoken about police reform on the campaign trail, and outlined his plan to deal with the issue in his broader "Racial Justice Plan."

Booker also has advocated for criminal justice reform on and off of the campaign trail, sponsoring the First Step Act, which resulted in the release of thousands of prisoners convicted on drug-related offenses.

He also introduced the Second Step Act, which would improve bias training for law enforcement, among a number of other reforms.

However, some 2020 presidential candidates have faced backlash on the issue of criminal justice.

Former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE has been hit by a number of Democratic primary opponents for supporting the 1994 crime bill, while 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 has been criticized for his handling of the police shooting of Eric Logan, an unarmed black man, in the city last month.

Biden and Buttigieg have yet to comment on the Justice Department's decision not to charge Pantaleo.