Presidential candidates starting to focus on California

(KTVU) - Although the California Primary is still more than a month away, the presidential candidates are beginning to set up in the state.

Democratic frontrunner Hillary Clinton is opening a campaign office Thursday in Oakland.

It will be located in downtown Oakland, on 14th street.

Challenger Bernie Sanders is also focusing on California, devoting much of his resources to the state.

Republican frontrunner Donald Trump is kicking off his California campaign Thursday in Orange County.

Trump will hold a rally in Costa Mesa, before making his way up to the Bay Area for this weekend's GOP state convention.

All three Republican candidates, Trump, Ted Cruz and John Kasich are scheduled to speak at the convention in Burlingame.

The California Primary is June 7.