US Defence Secretary, Lloyd Austin has been reported to be hospitalized for an emergency bladder issue.
It was also stated tha has transferred duties to his deputy, Kathleen Hicks, while in hospital.
It has been reported that Austin, 70, will remain at the Walter Reed National Military Medical Center in Virginia for treatment.
The Pentagon said the White House and senior officials had been informed.
The defence secretary was under scrutiny for failing to disclose his prostate cancer diagnosis and hospital stays in December and January, for which he tendered an apology last week.
Austin is scheduled to travel to Brussels this week for a Wednesday meeting on the ongoing war in Ukraine. It is not yet clear if his hospital stay will impede those plans.
Late last year, he had surgery for prostate cancer.
He was readmitted to hospital on New Year’s Day with severe pain in his leg, hip and abdomen because of complications related to the procedure.
An evaluation found a urinary tract infection and he remained in hospital for more than two weeks.
Senior defence officials and the Biden administration did not know that Austin was seriously ill until three days after his re-admission in January.
During a press conference last week, Austin said he had never directed anyone in his staff to hide his time in hospital from the White House or the public, but did not answer questions about whether staffers had acted outside of his orders.
Still, the defence secretary said he was “deeply sorry” for failing to provide appropriate notice and said he had apologised personally to President Joe Biden.
“I did not handle this right, I should have told the president about my cancer diagnosis.” He said
The defence secretary is just below the president in the chain of command for the US military, and is regarded as one of the most important members of the cabinet.
The incident incited concerns over both transparency and security and prompted three separate investigations into Austin’s handling of his illness and hospital stays.
Some prominent Republicans called for Austin to be removed from his post.
President Biden however, stood by Austin, saying he remained confident in his secretary’s leadership, but added that it was “sub-optimal” that he had not disclosed the seriousness of his illness.
He is scheduled to testify before Congress at the end of this month about his failure to notify government leaders.
Austin, a retired four-star general, became the first African-American defence secretary in 2020.