General David Petraeus will testify on Friday at a closed-door congressional hearing about the attack on the U.S. consulate in Benghazi.
The House Permanent Select Committee on Intelligence said in a statement that Petraeus will appear on Friday morning.
A US official has told AP news agency that the US military has suspended Paula Broadwell's security clearance.
President Obama praised the work of former CIA chief General David Petraeus. Speaking to reporters he said the General had served America "with great distinction" and from what he knows at "this point in the investigation", did not act in a way that compromised national security.
"I have no evidence, from this point, from what I have seen, that classified information was disclosed that would have impacted on our national security."
President Obama has said he had seen no evidence that former CIA chief General David Petraeus compromised national security during his affair:
I have no evidence, from this point, from what I have seen, that classified information was disclosed that would have impacted on our national security.
General Petraeus served his country with great distinction. We are safer because of the work that he has done. My main hope right now is that he and his family can move on, and this ends up being a single side note on what is an otherwise extraordinary career.
The news conference will begin broadcasting live at 6:30pm UK time.
The Royal United Services Institute (RUSI) has postponed the presentation of its highest honour to General David Petraeus. A spokesman said:
General Petraeus was due to visit London this month to receive the Chesney Gold Medal award from the Royal United Services Institute for his role in devising and implementing the US counter-insurgency doctrine that was used to turn around the war in Iraq and reshape the campaign in Afghanistan.
In light of the recent events, the presentation...will now be postponed until early 2013.
David Petraeus will testify before the Senate Intelligence Committee regarding the attack on the US consulate in Benghazi. Dianne Feinstein, the Senate Intelligence Committee Chairman, told Politico:
"Mr Petraeus has indicated his willingness. He is eager to come before the committee so we will work out the details."
Mr Petraeus has not been seen since Friday, when the news of his affair with Mrs Broadwell broke.
The head of NATO, General Anders Fogh Rasmussen, said he had "full confidence" in General John Allen.
US Defence Secretary Leon Panetta warned against "leaping to any conclusions" about the country's top commander in Afghanistan, General John Allen.
No one should leap to any conclusions here. General Allen is doing an excellent job at ISAF, in leading those forces. He certainly has my continued confidence to lead our forces.
General John Allen is being investigated for "inappropriate communication" with the woman at the centre of the CIA affair scandal.Read the full story ›