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SAN DIEGO -- Vermont Sen. Bernie Sanders will bring his campaign for the Democratic presidential nomination back to the San Diego area on Saturday, his campaign announced Wednesday.

Sanders, who has remained in the race even though former first lady Hillary Clinton has a commanding lead in delegates, is scheduled to speak at Kimball Park in National City on Saturday evening.

The event is free and open to the public, with admittance beginning at 4:30 p.m. Admission will be first come, first served, but the public is encouraged to fill out an online RSVP form.

Sanders, who's coming off a victory in the Oregon primary and a close loss to Clinton in Kentucky, is hopeful that a victory in California's June 7 primary election will strengthen his position in this summer's Democratic convention.

According to the campaign, Sanders will speak about getting big money out of politics, his plan to make public colleges and universities tuition- free, combating climate change and ensuring universal health care.

Due to security concerns, attendees are being asked not to bring bags, and to carry only small personal items, such as keys and cell phones. Weapons, sharp objects, chairs, signs, banners and sticks will not be permitted.

An estimated 12,000 people attended a Sanders rally at the San Diego Convention Center in March.

Clinton supporters opened a campaign office for the former New York senator and secretary of state in downtown San Diego on Tuesday. Her husband, former President Bill Clinton, campaigned on her behalf in Balboa Park two weeks ago.

The remaining active Republican candidate, businessman Donald Trump, canceled tentative plans for a San Diego appearance earlier this month but is expected to reschedule soon.

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