Democratic presidential candidate U.S. Sen. Bernie Sanders will be in San Diego on Saturday, NBC 7 learned Tuesday.

He will hold a rally at Kimball Park at 7 p.m. in National City. Carpooling is encouraged as parking will be limited, according to Sanders' website.

National City Mayor Ron Morrison told NBC 7 the Sanders' campaign team approached them Tuesday about a visit.

The National City Council approved the visit in a meeting Tuesday night.

The city is expecting "thousands" to turn out for the event, he said. There will be heavy security, handled by the Secret Service.

Morrison says National City staff will meet with officials from Sanders' campaign to discuss details Wednesday.

The event is free, but an RSVP is recommended. The event is open starting 4:30 p.m. Saturday.

Meanwhile, Bernie Sanders is already in Southern California, speaking to thousands of supporters at Cal State Dominiguez Hills in Carson.

NBC 7 has also confirmed former President Bill Clinton will be in town this weekend.

The Hillary Clinton Campaign opened up an office in Bankers Hill Tuesday.

Local Clinton supporters Assembly Member Toni Atkins and Councilmember Todd Gloria, along with other elected leaders, hosted organizers and volunteers at the Hillary for America office.

Both Democratic candidates are ramping up their efforts to reach out to supporters ahead of the June 7th primary in California.

Ed. Note: A previous version of this article mentioned an event with President Clinton planned at the Rancho Bernardo Inn. The venue denies there is a scheduled event and has asked us to remove the mention.