Secretary of State Hillary Clinton's testimony about the attack on the U.S. consulate in Benghazi, Libya has been postponed due to an illness.
Clinton suffered a concussion last week after fainting from dehydration related to a stomach virus.
Doctors have advised that she cancel all work events for the next week.
Clinton was scheduled to testify this week before a pair of congressional panels about the Benghazi attack.
Republicans have questioned the Obama administration's response to the attack, which killed Ambassador Chris Stevens and three other Americans.