On Wednesday evening, Matt Paul, a hospital spokesman, said Bush had been taken to the hospital earlier that afternoon.
“He was brought here earlier today and diagnosed with a fracture in his neck. He is in stable condition and will be wearing a neck brace.”
Paul said the former president would be kept in overnight, and that it was “too early to say when he will be released”.
McGrath said Bush would stay “as long as needed.”
“But he is doing OK. He’s as tough as they get,” he said.
Bush – the oldest living former US president – was hospitalised in Houston over the Christmas period last year for treatment of shortness of breath. In 2012, he spent a lengthy spell in hospital to be treated for bronchitis and other complications.
The former president has lower-body Parkinsons, which causes a loss of balance, and has used wheelchairs since at least 2011.
Last week, Bush attended fundraising events in Maine with donors backing his son Jeb Bush’s campaign to win the Republican presidential nomination.
After Jeb Bush declared his intention to run – hoping to be the third of the Bush clan in the White House after his father and brother, George W Bush – Bush Snr said he was one of the “proudest parents in America”.
