WASHINGTON - Despite an adultery scandal that ended David Petraeus' tenure as CIA chief, the general may be called to testify in a Senate inquiry into the killing of four Americans at the US consulate in Benghazi, Libya, Senator Dianne Feinstein said Sunday.

She said there will be an investigation into why the FBI failed to inform her and others on the intelligence committee before Friday about the extramarital affair between Petraeus and his biographer, Paula Broadwell, when the FBI probe had been proceeding for weeks.

Petraeus had been scheduled to testify about the Benghazi case on Thursday in a closed session of the committee; Mike Morrell, the acting CIA director, is now expected to do so.

She said the committee may decide to call Petraeus in a future meeting of the intelligence panel on the Benghazi killings. Four US citizens were killed, including Ambassador Christopher Stevens.

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