Defense Secretary Lloyd Austin was hospitalized again on Sunday — this time "to be seen for symptoms suggesting an emergent bladder issue," the Pentagon announced.

The latest: "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," per a statement late Sunday from hospital doctors that noted he's expected to make a full recovery from the bladder issue.

• "At this time, it is not clear how long Secretary Austin will remain hospitalized," the statement added. "His cancer prognosis remains excellent."

The big picture: Austin was released from the hospital less than a month ago following complications from a treatment for prostate cancer.

• The initial secrecy surrounding that two-week hospitalization was criticized by lawmakers from both parties, with some calling for him to resign. He's due to testify over the matter later this month.

State of play: Pentagon press secretary Maj. Gen. Pat Ryder said in a statement earlier Sunday that Austin was taken to the hospital around 2:20pm Sunday over the potential bladder issue and was at the time "retaining the functions and duties of his office."

• Deputy Defense Secretary Kathleen Hicks and the chair of the Joint Chiefs of Staff were notified and "White House and Congressional notifications have occurred," Ryder said.
• "Secretary Austin traveled to the hospital with the unclassified and classified communications systems necessary to perform his duties," he added.
• Austin transferred functions and duties to Hicks just before 5pm ET, per a later statement from Ryder.

Go deeper: Defense Secretary Austin admits "we fell short" on hospitalization

Editor's note: This article has been updated with new details throughout.