US Former president George H. W. Bush remained in hospital in Houston, Texas, on Wednesday after being admitted there yesterday as a precautionary measure when he experienced shortness of breath.
The latest statement from his office said he was doing well.
Bush, 90, the 41st US president and the father of 43rd president - George W. Bush, ordered the launch of the Gulf War on August 2, 1991, to liberate Kuwait after Iraqi former dictator Saddam Hussein invaded Iraq's southern neighbor the previous August.
Bush, who is now in a wheelchair, was hospitalized two years ago with bronchitis but recovered after two months.
A Republican, Bush served as vice president of the United States under Ronald Reagan from 1981 to 1989 before assuming the presidency after the 1988 elections.
He served one four-year term, and was defeated in his re-election bid by Democrat Bill Clinton.
In the 1970s, he served as US envoy to China, then was appointed by President Gerald Ford as director of the Central Intelligence Agency,.
Bush, a Navy pilot during World War II, was shot down in the Pacific in 1944, then rescued by US sailors, and he received the Distinguished Flying Cross.
He worked in the oil industry in Texas before undertaking his political career.