Democratic presidential candidates Bernie Sanders and Hillary Clinton are both campaigning in California ahead of the June 7 primary, where polls are showing the two in a dead heat.

Bernie Sanders has focused his campaign energy into the California primary in recent weeks. He spoke at a rally in San Pedro on Friday. “Our ideas and belief in economic justice, in social justice, in racial justice, in environmental justice, in immigration reform and a path toward citizenship, in rebuilding inner cities throughout this country, in protecting the needs of the Native American people, our ideas are the future of this country” he said.

On Sunday, Sanders visited the original Delano headquarters of the United Farm Workers union, where he reiterated his call for a national ban on fracking when asked what he would do about poor water quality in the San Joaquin Valley. This comes as environmental groups are criticizing the Obama administration after two federal agencies finalized reports claiming fracking off the coast of California would pose no “significant” risk to the environment.