Representative Nancy Pelosi (D., Calif.) underwent a successful hip-replacement surgery on Saturday after sustaining injuries from a fall during an official trip to Luxembourg, her office said in a statement.

U.S. Department of Defense Secretary Lloyd Austin was hospitalized on Sunday for "symptoms suggesting an emergent bladder issue," officials have revealed.

"Earlier today, Secretary of Defense Lloyd J. Austin III was transported by his security detail to Walter Reed National Military Medical Center to be seen for symptoms suggesting an emergent bladder issue," Dr John Maddox, trauma medical director, and Dr Gregory Chesnut, director of the Center for Prostate Disease Research of the Murtha Cancer Center, said in a statement.

Defense Secretary Lloyd Austin transferred his duties to his deputy as he is hospitalized for treatment for symptoms “suggesting an emergent bladder issue,” according to the Pentagon.

Austin has been admitted into the critical care unit at Walter Reed National Military Medical Center, and it is “not clear how long Secretary Austin will remain hospitalized,” according to a statement released Sunday night from officials at the hospital.

U.S. Secretary of Defense Lloyd Austin was taken to a Washington, D.C. hospital on Sunday for treatment of "symptoms suggesting an emergent bladder issue", a Pentagon spokesman said.

Austin, 70, was retaining his duties during his hospitalization, Pentagon Press Secretary Maj. Gen. Pat Ryder said in a written statement.

Austin was criticized last month for failing to disclose a cancer diagnosis and subsequent hospitalizations in December and January, including to President Joe Biden. He apologized during a televised news briefing.

White House National Security spokesman John Kirby on Sunday said U.S. Defense Secretary Lloyd Austin's doctors think he may need additional care.

"We'll see, you know, when he can be released, but obviously they still feel like he may need some additional care. ... Part of that is just physical therapy," Kirby told CBS's "Face the Nation."

Kirby said "there is routine regular communication" between President Joe Biden and Austin and that the secretary remains "actively involved and engaged" from the hospital.

The Pentagon released new details Sunday about Defense Secretary Lloyd Austin’s continued hospitalization, saying he had a medical procedure Dec. 22, went home a day later and was admitted to intensive care Jan. 1 when he began experiencing severe pain.

The latest information came as members of both parties in Congress expressed sharp concerns about the secrecy of Austin’s hospital stay and the fact that the president and other senior leaders were kept in the dark about it for days.

The Pentagon did not tell President Joe Biden and other top officials about Defense Secretary Lloyd Austin’s hospitalization for three days, three U.S. officials said.

National security adviser Jake Sullivan and other senior White House aides didn’t know of Austin’s Jan. 1 hospitalization until the Defense Department sent over word Jan. 4, two other U.S. officials said. Sullivan informed Biden shortly after DOD’s Thursday notification.