However, the official could not say if the condition had to do with the pilot's mental or physical health.
Congress must find a way to finance government, raise the debt ceiling and fund transportation needs.
The Iranian president spoke to European and Russian leaders ahead of a March 31 deadline to finalize a draft nuclear agreement.
The documents reportedly show that the CIA considers Israel a “priority threat country,” along with Russia, China, Iran, Pakistan and Cuba.
Earlier, U.S. Secretary of State John Kerry had said that negotiations with Bashar Assad's regime may be needed to resolve the Syrian conflict.
Egypt has announced that a ground invasion of Yemen is forthcoming, and over 150,000 Saudi troops have reportedly been mobilized.
The unmanned aircraft will be solar powered and have a wingspan greater than that of a Boeing 737.