Former U.S. President George H.W. Bush has been hospitalized in Houston, Texas.
Spokesman Jim McGrath said in a statement that the 90-year-old was taken to hospital late on December 23 after experiencing shortness of breath.
McGrath said Bush was taken by ambulance to the Houston Methodist Hospital as a precaution.
He "will be held for observation, again as a precaution," he added.
Bush spent nearly two months in hospital and was discharged in January 2013 after treatment for a bronchitis-related cough and other health issues.
Bush, who can no longer use his legs, appeared seated in a wheelchair at an event in November in Texas with his son, former President George W. Bush.
In June, the elder Bush celebrated his 90th birthday by making a tandem parachute jump near his summer home in Maine.
