Supreme Court nominee Brett Kavanaugh denounced the “millions of dollars in money from outside left-wing opposition groups” during his testimony Thursday about sexual assault allegations, but he didn’t mention the millions spent by groups backing him.

The Judicial Crisis Network, the leading conservative nonprofit that is running advertisements in support of Kavanaugh’s confirmation, has spent about $12 million on the effort, according to sources familiar with the group — already more than the $10 million it spent in last year’s confirmation of Justice Neil Gorsuch.

The Judicial Crisis Network, as a 501(c) (4) tax-exempt social welfare organization, does not need to publicly disclose its donors. It does, however, report its federal lobbying, which last year included paying Sen. Jon Kyl, R-Ariz., who was a lobbyist at Covington & Burling until he returned to the chamber, replacing the late Sen. John McCain in September.

Kyl’s past paid lobbying for the Judicial Crisis Network, along with his unpaid role as Kavanaugh’s “sherpa” during this year’s confirmation process, has prompted some ethics experts and liberals to call on Kyl to recuse himself from voting on Kavanaugh’s nomination. Other experts in Senate ethics say Kyl’s past work is unlikely to trigger an actual conflict of interest as defined by the chamber’s rules. Kyl did not work for the Judicial Crisis Network in 2018.

A spokeswoman for Kyl did not yet provide comment.