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 (D-N.J.), who's believed to be considering a 2020 presidential run, raised nearly $1.1 million in the second fundraising quarter of 2018, according to a filing with the Federal Election Commission (FEC).

Booker, who’s not up for reelection this year, spent a little more than half a million dollars between April and June. He ended June with more than $3.5 million in the bank.

This is Booker's largest quarterly fundraising haul since the start of the 2018 cycle, and the first time he's raised more than $1 million in a single quarter.

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“I heard from constituents today asking about corporate PAC contributions. I'm joining several of my colleagues & no longer accepting these contributions,” Booker tweeted back in February.

“Our campaign finance system is broken. I thank @StopBigMoney for their work—it’s time to pass campaign finance reform.”

Booker has been an outspoken critic of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE and his Cabinet members.

The senator, who sits on the Judiciary Committee, has used his sharp criticism of the president’s Supreme Court nominee, Brett Kavanaugh, as a way to stand out among a potentially crowded 2020 field.

Booker told CNN last month that he’ll make a decision about whether he’ll run for president in 2020 at the end of this year.

"I'm not going to play coy. I'm sure after the midterm elections, I'll give it a look," Booker told CNN in a June interview. "But to me, my momentum, my energy, my focus is 2018 and making sure I get re-elected in 2020."