California Democrat Sen. Dianne Feinstein, longest-serving woman in the Senate, dies at 90

Sen. Dianne Feinstein, longest-serving woman in the Senate, dies at age 90, according to news reports Friday morning.

The California Democrat has over the past several months and years struggled with health issues and was planning to retire at the end of her term this year.

Feinstein, the oldest member of the Senate, faced calls to resign over health concerns, before her term ended.

Her cause of death had not been made public as of mid-Friday morning.

Feinstein is also a former San Francisco mayor. 

She missed key Senate votes for several months earlier this year, starting in February, after being diagnosed with shingles, then hospitalized in her efforts to recover.

She returned to Capitol Hill using a wheelchair and continued to face questions about whether she was physically and mentally capable of still being a senator. 

"It's a sad day for all of us," Senate Democrat leader Chuck Schumer said on the chamber floor. 

Tennessee GOP Sen. Marsha Blackburn offered her condolences on X, formerly called Twitter. 

"Senator Dianne Feinstein was a trailblazer for women in politics," she wrote. "Despite our differences, I enjoyed our work together to protect songwriters and take on Big Tech. My prayers are with her family.