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 this week has repeatedly been on the attack against Democratic presidential front-runner 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, said Thursday it wasn't enough to call President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE a "racist," adding that it was necessary to confront institutional racism.

Booker didn't mention the former vice president in his remarks, but the comments appeared to be pointed at Biden, who will share a debate stage with the New Jersey senator next week.

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"It is easy to call Donald Trump a racist now — you get no great badge of courage for that," Booker said in an address to the National Urban League on Thursday. "The question is, what were you doing to address structural inequality and institutional racism throughout your life?"

"Don’t just tell us what you’re going to do," he continued. "Tell us what you’ve already done."

"Don’t tell us you’re going to be a champion for our communities when you become president if you haven’t been a champion already," he said.

Booker is well behind Biden in the polls, but has drawn media attention with his repeated barbs targeting the former vice president.

Biden has a big lead among black voters in the presidential race, according to polls, and Booker's comments to the National Urban League could be a way to get such voters to take a second look at the race.

Booker and Biden exchanged barbs on Wednesday over criminal justice reform.

The New Jersey senator called Biden an “architect of mass incarceration," referring to the 1994 crime bill that Biden helped pass in the Senate.

“For a guy that helped to be an architect of mass incarceration, this is an inadequate solution to what is a raging crisis in our country,” Booker told reporters in Detroit after appearing at an NAACP forum.

Biden's campaign quickly hit back at Booker, who will be standing next to the former vice president at next week's presidential debate.

“Since next week’s debate format will give Senator Booker twice as much time to make his attacks than it allows Vice President Biden to respond to them, we thought we would begin to respond now,” said Kate Bedingfield, Biden’s deputy campaign manager.

Beddingfield then attacked Booker's record on criminal justice as the mayor of Newark, N.J., saying he “has some hard questions to answer about his role in the criminal justice system.”

She also accused Booker of "running a police department that was such a civil rights nightmare that the US Department of Justice intervened.”

The response from the Biden campaign was not only a response to Booker's comments but also a preview of the former vice president's strategy in next week's debate.

Biden will stand between Booker and 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.), who hit Biden on civil rights during the first Democratic debate, at next week's debate.