Democratic presidential hopeful 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.) raised $4.5 million in the second quarter, according to his presidential campaign.

Booker's campaign reported that 88 percent of donors in the second quarter were first-time donors to the campaign and that the campaign will report having $5.4 million cash on hand.

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The haul trails Bookers' first-quarter fundraising, which came in at $5 million.

The announcement comes as Booker's fellow presidential candidates follow their second-quarter filings with the Federal Election Commission.

South Bend, Ind., Mayor Pete Buttigieg leads the quarter two fundraising pack, raising $24.8 million in the past three months. 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 raked in $21.5 million in that same period.

Booker leads former Rep. Beto O'Rouke (D-Texas), who announced a haul of around $3.6 million in the second quarter.

He also leads fellow 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.) and Washington 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), who brought in $2.3 million and over $3 million, respectively, during the second quarter.