Senate Intelligence Committee Chairwoman Dianne Feinstein has called the demand by Capitol Hill Republicans for more Benghazi investigations a "lynch mob," saying the matter already has received sufficient congressional oversight.

"I think it's ridiculous. I think it's a hunting mission for a lynch mob," said the California Democrat during an interview with CNN's "State of the Union" that aired Sunday.

Feinstein said several congressional committees, including her own, already have investigated the 2012 attacks that killed U.S. Ambassador Christopher Stevens and three other Americans. And despite Republican accusations that the Obama administration has lied about its response to the attacks, she suggested those reports showed no maleficence by the White House.

When asked by show host Candy Crowley if those reports answered all pertinent questions regarding the attacks, Feinstein responded; "I believe they have."

"Our [committee] report was bipartisan, and [questions] were certainly answered to the satisfaction of the intelligence committee," the lawmaker said.

Feinstein suggested Republican zeal for more Benghazi probes smacks of hypocrisy because the party decades earlier didn't demand major investigations into the 1983 terrorist attack on a U.S. military compound in Beirut that killed 241 American servicemen.

"If you compare [Benghazi] to Ronald Reagan, the big Republican hero, and what happened in Beirut ... and Reagan admitted we weren't ready for it," she said.

The Republican-controlled House voted earlier this month to establish a 12-member special panel to investigate the attacks. The select committee was set up to include seven Republicans and five Democrats, though House Minority Leader Nancy Pelosi, D-Calif., hasn't committed Democrats to participate.

Last week Senate Democrats rejected a request by Sen. Ted Cruz, R-Texas, for the upper chamber to create a similar committee. And Senate Majority Leader Harry Reid, D-Nev., has shown no interest in a creating another Benghazi panel.