George Bush Sr has been moved into intensive care after suffering "a series of setbacks that include a persistent fever," according to a family spokesman.
Doctors are "cautiously optimistic" about the 88-year-old former president's health, he added.
Video report by Debi Edward.
More top news
High street stores con customers by offering "discounts" which offer little to no savings - and may end up costing more, Which? has claimed.
Britain has claimed victory over Germany in a special football match marking 100 years since the near-legendary WWI Christmas truce match.
A new medication derived from cannabis could help reduce seizures in children with severe epilepsy - and is now being trialled in the UK.