WASHINGTON — The head of the Senate Intelligence Committee said former CIA director David Petraeus has agreed to testify to Congress about the attacks on the US Consulate in Benghazi, Libya, on Sept. 11 that killed the US ambassador and three other Americans.

Senator Dianne Feinstein, a California Democrat, said Wednesday that Petraeus, who resigned from the CIA post on Friday because of an extramarital affair, indicated his willingness to testify.