Several Democrats running for the 2020 presidential nomination took to Twitter on Wednesday to mark Juneteenth, the celebration commemorating the end of slavery in the U.S.

Juneteenth this year comes as the House Judiciary Subcommittee on the Constitution, Civil Rights and Civil Liberties holds a hearing on slavery reparations. Several presidential contenders have endorsed legislation that would form a commission to study the prospect.

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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.), who will testify at Wednesday’s House hearing, introduced the first reparations bill to the Senate since Reconstruction, which would establish a commission to examine the impacts of slavery in the U.S. and recommend ways to compensate the descendants of slaves.

Sens. 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.), 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.), 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.), 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.) and Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (D-Minn.), all fellow 2020 contenders, have co-sponsored the legislation.

“Celebrating #Juneteenth by remembering those fearless leaders who fought for abolition, while recognizing the enormous work that remains to be done to achieve true freedom from economic inequity, mass incarceration, and racial disparities,” Booker tweeted Wednesday.

Celebrating #Juneteenth by remembering those fearless leaders who fought for abolition, while recognizing the enormous work that remains to be done to achieve true freedom from economic inequity, mass incarceration, and racial disparities. — Sen. Cory Booker (@SenBooker) June 19, 2019

“On Juneteenth, we recognize emancipation and honor those who fought and died in the fight to end slavery. Still, the fight for equality and equity is far from over as Black Americans still face injustice — from our justice system to the ballot box. We fight on,” Harris echoed.

On Juneteenth, we recognize emancipation and honor those who fought and died in the fight to end slavery. Still, the fight for equality and equity is far from over as Black Americans still face injustice — from our justice system to the ballot box. We fight on. — Kamala Harris (@KamalaHarris) June 19, 2019

"Juneteenth should be a national holiday," Sanders tweeted, attaching an image saying he was endorsing an effort by a Texas activist to get the federal government to recognize the celebration.

Juneteenth should be a national holiday. pic.twitter.com/kMMMoMOuHp — Bernie Sanders (@BernieSanders) June 19, 2019

“Juneteenth isn’t just about celebrating the end of slavery in Texas. It’s a necessary reminder that 154 years later, Black Americans still feel the harsh reality that the fight for racial equality in our country is far from over. I’m in that fight all the way,” Warren said.

Juneteenth isn’t just about celebrating the end of slavery in Texas. It’s a necessary reminder that 154 years later, Black Americans still feel the harsh reality that the fight for racial equality in our country is far from over. I’m in that fight all the way. — Elizabeth Warren (@ewarren) June 19, 2019

“On Juneteenth, we celebrate emancipation—but we must also acknowledge the shadow slavery still casts. We can't change our past, but we must keep working toward a more just future: starting with finally studying reparations, ending mass incarceration, and enacting postal banking,” Gillibrand tweeted.

On Juneteenth, we celebrate emancipation—but we must also acknowledge the shadow slavery still casts.



We can't change our past, but we must keep working toward a more just future: starting with finally studying reparations, ending mass incarceration, and enacting postal banking. — Kirsten Gillibrand (@SenGillibrand) June 19, 2019

“On Juneteenth, we're celebrating a powerful moment in history. But it's a moment whose promise is not yet realized as we fail to address a legacy of slavery, segregation, and suppression that is alive in this country. The fight for true freedom, justice, and equity must go on,” former Rep. Beto O’Rourke (D-Texas) said.

“Today as we celebrate #Juneteenth and reflect upon the end of slavery 154 years ago, we must acknowledge that the fight for racial equality in the United States is not over. We must confront white supremacy in America and continue to push for freedom and justice for all,” Rep. Eric Swalwell Eric Michael SwalwellSwalwell calls for creation of presidential crimes commission to investigate Trump when he leaves office 'This already exists': Democrats seize on potential Trump executive order on preexisting conditions Swalwell: Barr has taken Michael Cohen's job as Trump's fixer MORE (D-Calif.) tweeted.

Today as we celebrate #Juneteenth and reflect upon the end of slavery 154 years ago, we must acknowledge that the fight for racial equality in the United States is not over. We must confront white supremacy in America and continue to push for freedom and justice for all. — Rep. Eric Swalwell (@RepSwalwell) June 19, 2019

“Today we do more than commemorate the abolition of slavery. We redouble our efforts to fight against racism that still exists in our country, bridge the systemic inequality faced by too many Americans, and keep building that more perfect union. #Juneteenth,” Gov. Steve Bullock Steve BullockMcConnell locks down key GOP votes in Supreme Court fight Senate Democrats demand White House fire controversial head of public lands agency Pence seeks to boost Daines in critical Montana Senate race MORE (D-Mont.) said.

Today we do more than commemorate the abolition of slavery. We redouble our efforts to fight against racism that still exists in our country, bridge the systemic inequality faced by too many Americans, and keep building that more perfect union. #Juneteenth — Steve Bullock (@GovernorBullock) June 19, 2019

"Slavery is a stain on our founding values of liberty, justice, and equality. On Juneteenth, we celebrate the end of slavery, and we recommit to continuing to become a more perfect union for everyone," Sen. Michael Bennet Michael Farrand BennetOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency Next crisis, keep people working and give them raises MORE (D-Colo.) tweeted.

Slavery is a stain on our founding values of liberty, justice, and equality. On Juneteenth, we celebrate the end of slavery, and we recommit to continuing to become a more perfect union for everyone. — Michael Bennet (@MichaelBennet) June 19, 2019

"June 19th is an important day in American history - the day of emancipation of hundreds of thousands of African Americans. We yet have a very long way to go. Let our history inform our shared future," entrepreneur Andrew Yang Andrew YangDoctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls Buttigieg launches his own podcast MORE said.

June 19th is an important day in American history - the day of emancipation of hundreds of thousands of African Americans. We yet have a very long way to go. Let our history inform our shared future. pic.twitter.com/rcxo5dUDVT — Andrew Yang (@AndrewYang) June 19, 2019

" # Juneteenth is a day of celebration — but also a poignant reminder that the fight for justice and equality didn’t end with slavery. More than a century and a half later, we must recommit ourselves to ending systemic racism in all its forms and achieve true equality for everyone," Gov. Jay Inslee Jay Robert InsleeBarr asked prosecutors to explore charging Seattle mayor over protest zone: report Bottom line Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D-Wash.) tweeted.

#Juneteenth is a day of celebration — but also a poignant reminder that the fight for justice and equality didn’t end with slavery. More than a century and a half later, we must recommit ourselves to ending systemic racism in all its forms and achieve true equality for everyone. — Jay Inslee (@JayInslee) June 19, 2019

"Today, on # Juneteenth, we commemorate the end of slavery in the U.S., as word of emancipation reached Texas. We have a responsibility to continue working towards true equality, and to address the original sin of slavery," former Housing and Urban Development Secretary Julian Castro Julian CastroSanders says Democrats should have given more speaking time to progressives Castro says DNC should have put more Latino speakers on stage from beginning Jill Biden defends husband's cognitive ability from Trump attacks: 'It's ridiculous' MORE said.

Today, on #Juneteenth, we commemorate the end of slavery in the U.S., as word of emancipation reached Texas. We have a responsibility to continue working towards true equality, and to address the original sin of slavery. /1 — Julián Castro (@JulianCastro) June 19, 2019

"Today on # Juneteenth, we celebrate the effective end of slavery in the US. Though the fight for equality and opportunity for all is far from over, on days like today, we must remember to not lose faith in each other and our ability to heal, together," former Gov. John Hickenlooper John HickenlooperThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Cook Political Report shifts Colorado Senate race toward Democrat Willie Nelson playing at virtual fundraiser for Hickenlooper MORE (D-Colo.) tweeted.

Today on #Juneteenth, we celebrate the effective end of slavery in the US. Though the fight for equality and opportunity for all is far from over, on days like today, we must remember to not lose faith in each other and our ability to heal, together. — John Hickenlooper (@Hickenlooper) June 19, 2019

"The Emancipation Proclamation didn't end slavery. The Civil Rights Movement didn't end oppression. This Juneteenth, let's honor the progress made and recommit ourselves to the work we still have to finish. #Juneteenth," 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 said.

The Emancipation Proclamation didn't end slavery. The Civil Rights Movement didn't end oppression. This Juneteenth, let's honor the progress made and recommit ourselves to the work we still have to finish. #Juneteenth pic.twitter.com/YcmFg2F3p8 — Mayor Bill de Blasio (@NYCMayor) June 19, 2019

"On this day, we recognize the end of slavery in the US. As we commemorate all that African Americans have overcome, let's not forget the challenges many still face. We will continue fighting to end systemic racism in this country, and to achieve true equality for all. # Juneteenth," former Rep. John Delaney John DelaneyCoronavirus Report: The Hill's Steve Clemons interviews Rep. Rodney Davis Eurasia Group founder Ian Bremmer says Trump right on China but wrong on WHO; CDC issues new guidance for large gatherings The Hill's Coronavirus Report: Kansas City Mayor Quinton Lucas says country needs to rethink what 'policing' means; US cases surpass 2 million with no end to pandemic in sight MORE (D-Md.) tweeted.

On this day, we recognize the end of slavery in the US. As we commemorate all that African Americans have overcome, let's not forget the challenges many still face. We will continue fighting to end systemic racism in this country, and to achieve true equality for all. #Juneteenth — John Delaney (@JohnDelaney) June 19, 2019

"On # Juneteenth, we celebrate emancipation while recognizing the injustices that continued after slavery. We must not let progress distract us from today's fight against voter suppression, mass incarceration & the racial wealth gap. We still have work to do to right these wrongs," Rep. Tim Ryan Timothy (Tim) RyanNow's the time to make 'Social Emotional Learning' a national priority Mourners gather outside Supreme Court after passing of Ruth Bader Ginsburg Lincoln Project hits Trump for criticizing Goodyear, 'an American company' MORE (D-Ohio) said.

On #Juneteenth, we celebrate emancipation while recognizing the injustices that continued after slavery. We must not let progress distract us from today's fight against voter suppression, mass incarceration & the racial wealth gap. We still have work to do to right these wrongs. https://t.co/66VGIa79o6 — Congressman Tim Ryan (@RepTimRyan) June 19, 2019

"#Juneteenth is a celebration of the end of slavery and liberation of black Americans, but it’s also a reminder of the work that lies ahead, the work required to overcome delayed justice, and the need to build a more fair and equitable society," Sen. Amy Klobuchar (D-Minn.) tweeted.

#Juneteenth is a celebration of the end of slavery and liberation of black Americans, but it’s also a reminder of the work that lies ahead, the work required to overcome delayed justice, and the need to build a more fair and equitable society.https://t.co/HcOswxLsUP — Amy Klobuchar (@amyklobuchar) June 19, 2019

Racial justice has emerged as a central issue in the Democratic presidential primary, with candidates unveiling a slate of policies to rectify racial inequities, including boosting funds to small businesses run by entrepreneurs of color and increasing efforts to reduce maternal mortality rates among black mothers.

Updated at 3:59 p.m.