Incoming Sen. Laphonza Butler (D-CA) is being sworn in by Vice President Kamala Harris, days after longtime Sen. Dianne Feinstein (D-CA) died at the age of 90.

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The swearing-in ceremony is scheduled to take place at 3 p.m. EDT from Capitol Hill. Butler was appointed by Gov. Gavin Newsom (D-CA) to finish the remainder of Feinstein's term, which is slated to end in January 2025.

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The primary race to fill the seat is expected to be hotly contested between three Democratic members of the House of Representatives: Reps. Katie Porter (D-CA), Adam Schiff (D-CA), and Barbara Lee (D-CA). Newsom's office said that Butler may run for the full term after previously implying an appointee to replace Feinstein would be a caretaker of the seat until the 2024 election.