Sen. Cory Booker, D-N.J., speaks during the confirmation hearing for former ExxonMobil CEO Rex Tillerson, U.S. President-elect Donald Trump's nominee for Secretary of State, before Senate Foreign Relations Committee Jan. 11, 2017, on Capitol Hill in Washington. Alex Wong/Getty Images

New Jersey Democratic Sen. Cory Booker — a potential 2020 White House contender and recipient of major campaign contributions from Jared Kushner and others in the Kushner family — declined to endorse his party's call for the White House to revoke the security clearance of the president's son-in-law.

The Democratic National Committee has called for Kushner's security clearance to be revoked after reports that he sought to set up back-channel communications with Russian officials. Similarly, Rep. Adam Schiff — the senior Democrat on the House Intelligence Committee — said Kushner's security credentials should be reviewed.

Booker refused to support those calls during an interview with CNN Sunday. Asked if supports revoking Kushner's security clearance, the New Jersey senator said: "I think we need to first get to the bottom of it. He needs to answer for what was happening at the time. It raises very serious concerns for me. And that could be a potential outcome that I seek, but I want to understand, at least hear from Jared Kushner, as well as the administration, about what was exactly going on there."

Booker also pushed back against those calling for Trump's impeachment, saying, "I'm not going to rush to impeachment."

Kushner and other donors affiliated with Kushner Cos. delivered more than $41,000 to Booker's Senate campaign in 2013, according to data compiled by Politico reported that Ivanka Trump hosted a fundraiser for Booker during that election.

In 2009, Jared Kushner also gave $20,000 to Booker's Newark mayoral ticket "Booker Team for Newark," New Jersey campaign finance records show. That year, Booker attended the wedding of Kushner and Ivanka Trump.

Booker has in the past made headlines taking stances at odds with others in his party. During the 2012 election, for instance, Booker defended the private equity industry and slammed Barack Obama's campaign for attacking then-Republican nominee Mitt Romney's private equity firm, Bain Capital. More recently, Booker cast a pivotal vote against Democratic legislation to allow Americans to buy lower-priced prescription drugs from Canada.