Attendees at a rally chanted "Lock her up!" Tuesday evening after President Trump conjectured that Sen. Dianne Feinstein, D-Calif., leaked a letter to the media sent to her from the primary sexual assault accuser of Supreme Court Justice Brett Kavanaugh.

"How about Sen. Feinstein? That’s another beauty," Trump said to applause in Iowa Tuesday evening.

"Did you leak the documents?" Trump said before jokingly mimicking Feinstein's denial. The crowd immediately broke out into a round of "Lock her up!" chants, which have previously been reserved for former Secretary of State Hillary Clinton.

"Did she leak it? 100 percent," Trump continued. "No, I don’t want to get sued. Ninety-nine percent. Now I can’t get sued."

[More: Trump mocks Feinstein over leak of letter accusing Kavanaugh of sexual assault]

The president insinuated that Feinstein, or a member of her staff, leaked a letter originally sent to her from Christine Blasey Ford that described an alleged encounter between Ford and Kavanaugh in the early 1980s.

Ford accused Kavanaugh of holding her down on a bed, covering her mouth with his hand, and trying to remove her clothing against her will at a high school party in the summer of 1982, when she was 15 and he was 17. Kavanaugh has denied the allegation.