Former President George H.W. Bush will remain at a Houston hospital Wednesday night "as a precaution," a spokesman said. The 41st president, 90, was taken by ambulance to Houston Methodist Hospital on Tuesday because of shortness of breath.

"President Bush had a good day and his prognosis remains positive," spokesman Jim McGrath said in a statement Wednesday evening.

Bush has had some health problems in recent years, and was hospitalized for more than seven weeks in late 2012 and early 2013 for conditions including bronchitis. But this June, he marked his 90th birthday the way he celebrated his 75th, 80th and 85th birthdays — by skydiving.

Bush, who uses a wheelchair, made a rare public appearance last month at his presidential library at Texas A&M University, where his son George W. Bush, the 43rd president, was promoting a new book he wrote about his father.

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