The oldest sitting U.S. Senator is San Francisco’s own Dianne Feinstein, the former mayor who’s running for Senate again in 2018 and, if elected, would be 85 years old at the beginning of her fifth term. Feinstein’s campaign has the big-name support of her fellow California senator Kamala Harris and House Minority leader Nancy Pelosi, but some Democrats are declaring they’ve had enough of Feinstein. The San Francisco Chronicle reports that four members of the San Francisco Board of Supervisors are endorsing Feinstein’s opponent for the senate seat, Los Angeles state senator Kevin de León.

The Chronicle names supervisors Jane Kim, Hillary Ronen, Aaron Peskin and Norman Yee as openly endorsing de León. SF Weekly has independently confirmed Sup. Peskin and Sup. Yee’s endorsements of de León, but has not received responses from Sup. Kim and Sup. Ronen’s offices. (Update 11/14: Sup. Kim’s office has confirmed to SF Weekly her endorsement of Sen. de León.)

“I respect what Senator Feinstein has done in the past, but I am supporting the future leader of California now,” Sup. Norman Yee tells SF Weekly, confirming his endorsement Feinstein’s Democratic senate opponent.

You may not have heard of Kevin de León, but he is Feinstein’s highest profile opponent in the 2018 senate race. He’s a Los Angeles native who was elected to the state assembly in 2006, took state senate office in 2010, and in 2014 became California’s first Latino Senate President Pro Tempore in more than 130 years.

Feinstein has frustrated many local Democrats by voting in line with President Trump’s position more than 30 percent of the time since his election. She was recently booed at the Commonwealth Club for saying of Trump, “he can be a good president.”

While de León has some support on the S.F. Board of Supervisors, all five members of the Los Angeles County Board of Supervisors have endorsed Feinstein in the race. Additionally, de León could find himself embroiled in a sexual harassment scandal wherein State Sen. Tony Mendoza is accused of inappropriately inviting an intern to spend the night at his apartment. Mendoza and de León live together in that apartment.

California has a “top two” primary system, so the Democrats Feinstein and de León may end up running against each other in both the June 5, 2018 primary and the Nov. 6, 2018 general election.