Sen. Sheldon Whitehouse (D-RI) used a third of his time allotted for questioning Judge Kentanji Brown Jackson on Tuesday to instead speak about “dark money” groups influencing Supreme Court nominations.

Whitehouse spent more than ten minutes during the Senate Judiciary Committee’s confirmation hearing for Jackson attempting to differentiate between “a dark money interest rooting for” a particular Supreme Court nominee and “right-wing dark money interests having a role in actually picking” nominees.

Dark money, a term Whitehouse mentioned a dozen times during his remarks, refers to political funding that cannot be traced back to specific donors.

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Dark money organizations predominately include 501(c) groups, which, as Open Secrets details, are not required to disclose their donors’ names or other sources of money. Some 501(c) groups can therefore donate to political candidates or causes without the public knowing who is behind the funding of the groups.

Whitehouse, who himself is a beneficiary of dark money, began by saying, “I’ll be the first to concede that there is dark money on both sides, and I hope very much we can get rid of it on both sides shortly by legislation.”