Democrat Ro KhannaRohit (Ro) KhannaYoung insurgents aren't rushing to Kennedy's side in Markey fight Khanna: I 'didn't appreciate' Castro's attack on Biden Overwhelming majority of voters want lawmakers to work with other party MORE's campaign says he will continue his primary against Rep. Mike HondaMichael (Mike) Makoto HondaYoung insurgents aren't rushing to Kennedy's side in Markey fight Ex-congressman launching PAC to defend Dem seats in 2020 Silicon Valley lawmaker backs Apple in terror case MORE (D-Calif.) rather than run for retiring Rep. George MillerGeorge MillerPelosi names new chief of staff Dem duo poses test for Trump, GOP Lawmakers honor retiring Calif. Reps. Waxman, Miller MORE's (D-Calif.) seat.

"Representative George Miller has been a tireless advocate for working families and he will be missed in Congress. As for Ro, he will continue to work hard for the opportunity to represent the people of California's 17th district," Khanna spokesman Tyler Law told The Hill in a statement.

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Miller's retirement announcement Monday morning had many California Democrats speculating that Khanna might run for his seat. Miller's East Bay district is about 40 miles to the north of the Silicon Valley district where Khanna is challenging Honda. He would have started off with a huge cash advantage over potential opponents if he had decided to go that route.

Khanna had considered a run against then-Rep. Pete Stark (D-Calif.) in a different nearby district in 2012, but took a pass on the race. Stark lost a primary to Rep. Eric Swalwell (D-Calif.), leaving Khanna with few options for an easy House race. He's been raising big money against Honda, a longtime congressman, and could be competitive in the race.

Some California Democrats believe Khanna could reconsider his decision not to run in the now-open 11th District, however.