Holder, Mueller face mounting questions on why Petraeus probe kept under wraps Attorney General Eric Holder and FBI Director Robert Mueller are facing mounting questions over why they neglected to tell the rest of the Obama administration about the investigation into David Petraeus until Election Day, with one top lawmaker now demanding answers from the officials. The FBI apparently was sitting in two inquiries. One involved the extramarital affair uncovered between Petraeus and biographer Paula Broadwell. The other involved "inappropriate communications" between lead commander in Afghanistan Gen. John Allen and Jill Kelley, a woman tied to the Petraeus scandal. Though the FBI investigation that stumbled onto Petreaus' affair had been underway since as early as June and Holder knew since late summer, the Justice Department did not loop in Director of National Intelligence James Clapper -- who then told the White House -- until last Tuesday. It's unclear how long the FBI was looking at Allen, but according to the Pentagon that case was not forwarded to them until this past Sunday. Rep. Lamar Smith, R-Texas, chairman of the House Judiciary Committee, fired off letters on Tuesday to Holder and Mueller demanding answers about when they knew and why this was kept so secret. "Since the resignation of Central Intelligence Agency (CIA) Director David Petraeus on Friday, Nov 9, it has become clear that the Federal Bureau of Investigation (FBI) began an investigation this summer that uncovered his extramarital affair with a journalist as well as possible breaches of security," he wrote. However, White House and Congressional officials were reportedly first notified of the investigation and (its) connection to General Petraeus just last week. Smith said he wants "clarification" on the timeline. Lawmakers are also openly questioning when Petraeus first knew about the investigation -- and whether it impacted his statements to Congress on Sept. 14 about the Libya terror attack. Petraeus briefed lawmakers that day that the attack was akin to a flash mob, and some top lawmakers noted to Fox News he seemed "wedded" to the administration's narrative that it was a demonstration spun out of control. Rep. Peter King, R-N.Y., told Fox News he now questions whether Petraeus' statements -- which were in conflict with an FBI brief and in conflict with available raw intelligence -- were in any way impacted by the knowledge the FBI was investigating his affair with Broadwell. The White House insisted Tuesday that it was not aware of the Petraeus scandal until last Wednesday, blaming FBI "protocols" for not being informed earlier. The Justice Department reportedly told Clapper about the probe on Election Day. Meanwhile, the new acting director at the CIA, Mike Morell, was on Capitol Hill this week to brief lawmakers. Fox News' Catherine Herridge and Chad Pergram contributed to this report.