California Sen. Dianne Feinstein announced her retirement Tue. after three decades in the Senate and 53 years in politics.

Feinstein announced her retirement with a statement Tue.: "I will not run for reelection in 2024." (AP)

Feinstein was first elected to the Senate in 1992 after defeating GOP Sen. John Seymour in a special election. (AP)

Feinstein has served five terms in the U.S. Senate: she is set to serve out the rest of her term, which ends in 2025. (AP)

Who will replace Feinstein in the Senate? Here's a look at the field so far.

1. CA Rep. Katie Porter announced a run for Feinstein's Senate seat in Jan., becoming the first Democrat to join the race.

Porter currently represents California's 47th District in the House; she won reelection in 2022 by 3.4 points. (NYT)

Could Porter win? According to internal polling conducted by her campaign, Porter is leading the race by 11 points.

2. CA Rep. Adam Schiff also announced a Senate campaign in Jan., becoming the second Democrat to run for the seat.

Schiff famously led the first impeachment trial against Trump in 2020. He also served on the House Jan. 6 committee.

Schiff has one advantage over Porter: former House Speaker Nancy Pelosi endorsed his run for Senate early Feb.. (NYT)

3. According to the NYT, CA Rep. Barbara Lee is set on announcing a run for the Senate by the end of the month.

The NYT on Wed. reported that Lee filed formal Federal Election Commission paperwork for a 2024 Senate run.

A co-chair of the House Democratic Steering Committee, Lee is the highest-ranking Black woman in Congress. (NYT)

If elected, Lee would become the nation's third Black woman to become Senator, after Kamala Harris and Carol Moseley Braun.