Sen. Dianne Feinstein (D-CA) has been missing in action on Capitol Hill this week, as her office says her absence is for a health-related reason.
“The senator is in California this week dealing with a health matter,” a spokesperson for Feinstein told reporters.
“She hopes to return to Washington soon,” the representative added.
No further details were immediately divulged.
At the age of 89, Feinstein is the Senate’s oldest member, and in recent years her colleagues have raised concerns about her mental fitness.
Feinstein, who has been a member of the upper chamber since 1994, announced last month she would not seek re-election in 2024.
Three prominent House Democrats — Reps. Adam Schiff, Katie Porter, and Barbara Lee — have announced campaigns to replace Feinstein in the Senate.
Another Senate Democrat, John Fetterman of Pennsylvania, is experiencing health problems.
Fetterman, who suffered a stroke last year during his campaign, checked himself into a hospital two weeks ago to receive treatment for clinical depression, according to his office.
Democrats control the Senate with 48 members plus three independents, including Sen. Kyrsten Sinema of Arizona, who recently left the party. Republicans are the minority party with 49 seats in this session of Congress.