In this Junw, 2012 file photo, former President George H.W. Bush, and his wife, former first lady Barbara Bush, arrive for the premiere of HBO's new documentary on his life.

Houston - A spokesman says former President George H.W. Bush is in the intensive care unit at a Texas hospital.

Bush's spokesman, Jim McGrath, said on Wednesday evening that the former president has been in the ICU at Methodist Hospital in Houston since Sunday.

No details were immediately provided. But earlier Wednesday, McGrath said a fever that kept Bush in the hospital over Christmas had gotten worse and that doctors had put him on a liquids-only diet.

A bronchitis-like cough initially brought Bush to the hospital on November 23.

McGrath says the cough has improved, and that the 88-year-old is now coughing about once a day. - Sapa-AP