Former President George H.W. Bush was re-admitted to a hospital in Houston on Friday due to a case of pneumonia.
Family spokesman Jim McGrath told NBC News earlier Tuesday afternoon that Bush had been admitted as a precaution.
McGrath said on Wednesday that Bush "continues to gain strength".
Bush, 92, was hospitalized Friday for a persistent cough.
Just five days after his release from the hospital, Bush tossed the coin alongside his wife at the 2017 Super Bowl in Houston.
New 'Alien: Covenant' Images Include a Nasty Neomorph Chowing Down
The first image show a mysterious figure on the Engineer's planet, unleashing pods previously seen in Prometheus. Here are over 20 films worth seeing over the next four months.
Of course, as Radar previously reported, Bush has been confined to a wheelchair due to a battle with the disease vascular Parkinsonism.
Mr Bush on a ventilator in January and wrote to Donald Trump that attending his inauguration would put him "six feet under". It's his second case of respiratory illness in three months. In 2012, he spent Christmas in ICU after being admitted for bronchitis and other issues. Despite his loss of mobility, Bush celebrated his 90th birthday by making a tandem parachute jump in Kennebunkport, Maine. Just days after he celebrated his 92nd birthday he took 40 wounded warriors out on his boat for a fishing trip.
Bush is the father of ex-President George W. Bush and former Florida Governor Jeb Bush, who fought for the 2016 Republican presidential nomination. "Bush in Houston today", Clinton tweeted.
Mr Bush served a single term in the Oval Office as America's 41st commander-in-chief from 1989 through 1992.