US Secretary of Defense Lloyd Austin has been admitted to the critical care unit as he undergoes treatment for a bladder issue, the Pentagon said late Sunday, in a statement citing his doctors.

"Tonight, after a series of tests and evaluations, the Secretary was admitted into the critical care unit at Walter Reed National Military Medical Center for supportive care and close monitoring," the statement read.

Austin's hospitalization comes weeks after it emerged that the 70-year-old had kept previous hospital stays secret and had not immediately informed US President Joe Biden of a cancer diagnosis, sparking criticism as the United States faces crises in the Middle East and Ukraine

Austin effectively vanished from the public eye for treatment for prostate cancer in December and again in January after suffering complications from the procedure.

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This time, the public was alerted around two hours after he was sent to the hospital on Sunday afternoon, and Deputy Secretary of Defense Kathleen Hicks "assumed the functions and duties" of defense chief just before 5:00 pm (2200 GMT), according to Pentagon spokesman Pat Ryder.

"At this time, it is not clear how long Secretary Austin will remain hospitalized," added the latest statement, attributed to Dr John Maddox and Dr Gregory Chesnut of the Walter Reed National Military Medical Center in Maryland.

"The current bladder issue is not expected to change his anticipated full recovery. His cancer prognosis remains excellent."

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At the time, he said he was still in recovery, suffering from leg pain and using a golf cart for transportation inside the Pentagon.

The undisclosed absences -- as well as this current hospital stay -- come at a time when the United States faces a spiraling crisis in the Middle East, with American forces in Iraq and Syria facing near-daily attacks from Iran-backed militants in retaliation for Washington's steadfast support of Israel.

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The top US defense official is also a key figure in attempts by the Biden administration to maintain support for Ukraine's fight against Russian invasion, as Republican members of Congress refuse to authorize new funding for military aid to Kyiv.

Various Republican lawmakers previously called for Austin to be sacked, but Biden, while lamenting the Pentagon chief's lapse in judgment, has said he remains confident in his defense secretary.

Austin has gained a reputation as a largely apolitical public servant who is most comfortable with US troops.

A commanding presence at well over six feet tall, he is an intensely private person who eschews the spotlight, which he said played into his decision to keep the cancer diagnosis secret.

But he admitted that "taking this kind of job means losing some of the privacy that most of us expect. The American people have a right to know if their leaders are facing health challenges that might affect their ability to perform their duties, even temporarily."

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