The Kentucky senator, 81, was attending a private dinner in Washington when he tripped. He was admitted to a hospital for treatment, spokesman Doug Andres said.
McConnell’s office did not provide additional detail on his condition or how long he may be absent from the Senate.
In 2019, the GOP leader tripped and fell at his home in Kentucky, suffering a shoulder fracture. At the time, he underwent surgery to repair the fracture in his shoulder. The Senate had just started a summer recess and he worked from home for some weeks as he recovered.
First elected in 1984, McConnell in January became the longest-serving Senate leader when the new Congress convened, breaking the previous record of 16 years.
The Senate, where the average age is 65, has been without several members recently due to illness.
Sen. John Fetterman, D-Pa., 53, who suffered a stroke during his campaign last year, remains institutionalized with clinical depression. And Sen. Dianne Feinstein, D-Calif., 89, said last week that she had been hospitalized to be treated for shingles.
The Democrat absences have proven a challenge for Senate Majority Leader Chuck Schumer, D-N.Y., who is already navigating a very narrow 51-49 majority.
The Republicans, as the minority party, have had an easier time with intermittent absences. It is unclear if McConnell will be out on Thursday and if that would have an effect on scheduled votes. South Dakota Sen. John Thune is the Senate’s No. 2 Republican.
Adapted from reporting by the Associated Press