WATCH: Former Sen. Barbara Boxer wants possible CA Senate appointee to be 'woman of color'

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If Democratic president nominee Joe Biden and his running mate, California Senator Kamala Harris, win the White House this November, Gov. Gavin Newsom will have a vacancy to fill.

"I think Gov. Newsom has to make a decision," former U.S. Senator Barbara Boxer told KCBS Radio's Doug Sovern. "Does he want to kind of be a kingmaker and appoint someone who's going to run for the seat or does he want to get someone to just kind of keep the seat warm and do well, and not someone who's aggressively seeking reelection and then let the people decide."

Harris' seat was formerly occupied by Boxer, who retired from public service in 2017 after a 24-year run in the U.S. Senate. Before that, Boxer served 10 years in the U.S. House of Representatives and six years on the Marin County Board of Supervisors.

Boxer later founded PAC for a Change, a political action committee.

She's also teaching in the USC Dornsife School's Department of Political Science.

Committee ranking member Sen. Barbara Boxer (D-CA) questions witnesses during a Senate Foreign Relations Committee hearing concerning cartels and the U.S. heroin epidemic, on Capitol Hill, May 26, 2016, in Washington, DC.
Committee ranking member Sen. Barbara Boxer (D-CA) questions witnesses during a Senate Foreign Relations Committee hearing concerning cartels and the U.S. heroin epidemic, on Capitol Hill, May 26, 2016, in Washington, DC. Photo credit Drew Angerer/Getty Images

"Whatever (the governor) decides, I'm happy with as long as we keep this seat progressive and strong and I do think a woman of color is great," Boxer said. "(It) doesn't have to be that, but I think it reflects where we are as a state right now."

The Marin County native is known as a progressive champion for quality public education and a woman's right to choose, among other issues.

Boxer added she hasn't gotten any calls from potential candidates lobbying for the seat just yet.

"I'm assuming if everything goes well and Kamala is vice president, I will probably get several phone calls," Boxer laughed.

Names mentioned as possibilities to succeed the would-be VP make for a long list: Former Los Angeles Mayor Antonio Villaraigosa, California Secretary of State Alex Padilla, California Attorney General Xavier Becerra, Congresswoman Barbara Lee, Congresswoman Karen Bass, former U.S. Secretary of Labor Hilda Solis, Long Beach Mayor Robert Garcia and even San Francisco Mayor London Breed.