Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE's (D-N.J.) 2020 presidential campaign raised more than $5 million in the first quarter of 2019, according to an email it sent to supporters on Sunday.

The campaign added that 82 percent of the donors were first-time contributors to Booker, that the average online contribution was $34 and that the campaign now has $6.1 million in cash on hand.

NEW: In email to supporters, @corybooker says in the 2 months after becoming a candidate for president on 2/1, Cory 2020 has raised over $5 million. We will report over $6.1 million COH. pic.twitter.com/JySjhJlwHS — Sabrina Singh (@sabrinasingh24) April 7, 2019

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Booker's haul puts him behind those of several of his competitors, including Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.), Sen. Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (D-Calif.), former Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D-Texas) and South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegButtigieg stands in as Pence for Harris's debate practice Hillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield Facebook takes down Chinese network targeting Philippines, Southeast Asia and the US MORE.

Sanders led the field by raising $18.2 million in the first quarter, followed by Harris at $12 million, O'Rourke at $9.4 million and Buttigieg at $7 million.

Booker announced his White House bid on Feb. 1 and, like most of his 2020 Democratic rivals, has rejected money from corporate PACs.

Updated 1:45 p.m.