Sen. Dianne Feinstein (D-Calif.) on Sunday criticized Republicans for opening a fresh inquiry into the deadly 2012 attacks in Benghazi, Libya, and asserted that all questions have been answered about the matter.

"I think it's ridiculous. I think it's a hunting mission for a lynch mob," Feinstein, chairman of the Senate Intelligence Committee, said on CNN's "State of the Union." She was responding to a question about the committee that House Speaker John A. Boehner (R-Ohio) recently tasked with investigating the attacks.

"There have been four major reports. We spent a year and a half on a report. We held hearings. Thousands of pages were reviewed," Feinstein said.

In an appearance on NBC News's "Meet the Press," Republican National Committee Chairman Reince Priebus accused former secretary of state Hillary Rodham Clinton of trying to "sweep Benghazi under the rug."

"If you want any evidence of that, ask the families of people who lost their sons in Benghazi. They've talked plenty about what happened in Benghazi," Priebus said.