Senate Republican Leader Mitch McConnell was released from hospital Monday after being treated for a concussion and will continue his recovery at a rehabilitation center, a spokesman said.

McConnell’s office said his doctors over the weekend discovered he also suffered a minor rib fracture after he tripped and fell at the Waldorf Astoria hotel in Washington on Wednesday night.

Leader McConnell’s concussion recovery is progressing well and the leader was released from hospital today, McConnell spokesman David Popp said in a statement. On his doctor’s advice, the next step is a period of physical therapy at an inpatient rehabilitation clinic before returning home.

The office did not provide additional details about his condition or say how long McConnell would be out. Concussions can be serious injuries and take time to recover, and even a single concussion incident can limit a person’s options during recovery.

It is unclear how his extended absence will affect Senate proceedings. The Senate returns to Washington on Tuesday night after the weekend off and is scheduled for the remainder of March.

The 81-year-old Kentucky senator was at a dinner party following a reception for the Senate Leadership Fund, a campaign committee that worked with him, when he tripped and fell.

McManus: The real winner of the House speakership fight? Mitch McConnel

McConnell’s head injury comes nearly four years after he tripped and fell at his Kentucky home, suffering a fractured shoulder that required surgery. The Senate had just entered summer recess, and he worked from home for a few weeks while he recovered.

At the onset of the COVID-19 crisis, McConnell recounted his early childhood experiences battling polio. He described how his mother insisted that he stay upright as a toddler and worked with him on a determined physical therapy regimen. He has acknowledged that he has some difficulty climbing stairs in adulthood.

First elected in 1984, McConnell became the longest-serving Senate leader in January when the new Congress convened, breaking the previous record of 16 years.

McConnell is one of several senators who have been absent recently due to illness or hospitalization. Sen. John Fetterman (D-Pa.), 53, who suffered a stroke last year while campaigning, was expected to be out for several weeks as he was being treated for clinical depression. And Sen. Dianne Feinstein (D-Calif.), 89, said earlier this month she was hospitalized to be treated for shingles.