Former First Lady Barbara Bush was hospitalized shortly after her husband, George H.W. Bush, was sent to the ICU for pneumonia.
Doctors say they hospitalized Barbara, 91, at Houston Methodist Hospital "as a precaution" after she exhibited symptoms including "fatigue and coughing," the Daily Mail reports.
She is joining her 92-year-old husband in the same hospital only days after he was admitted.
News of their illness comes just as Donald Trump's inauguration approaches -- an event neither will now be able to attend.
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"Barbara and I are so sorry we can't be there for your inauguration on January 20th," wrote George H.W. Bush in a letter to Trump.
While Bush was admitted to the ICU, he is now reportedly in stable condition..
"Doctors performed a procedure to protect and clear his airway that required sedation," Houston Methodist Hospital spokesman Jim McGrath said. "President Bush is stable and resting comfortably in the ICU, where he will remain for observation."
Still, they do not think Bush should travel to the inauguration.
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"My doctor says if I sit outside in January, it likely will put me six feet under," explained Bush in the letter. "Same for Barbara. So I guess we're stuck in Texas."
However, they assured Trump and the country they will be there "in spirit."
"I want you to know that I wish you the very best as you begin this incredible journey of leading our great country," added Bush. "If I can ever be of help, please let me know."
While George H.W. Bush will not be attending Trump's inauguration, his son, former President George W. Bush, will be there alongside predecessors Bill Clinton and Jimmy Carter.
Many are now sending their best wishes to the Bush family, including President Barack Obama, USA Today reports.
"[They have been] a constant source of friendship and support and good counsel," said Obama in a news conference.
"They are as fine a couple as we know," he added. "Really good people."
Sources: Daily Mail, USA Today / Photo credit: David Valdez / White House Photo Office via Wikimedia Commons