In a final push to raise support ahead of California's June 7 primary, Sen. Bernie Sanders will stop by UC Berkeley Friday for a press-only meeting to discuss economic and trade issues.

Robert Reich, former US Secretary of Labor under the Clinton administration and professor at UC Berkeley, will join Sanders for the talk, which is scheduled to start at 5 p.m.

Reich has been a staunch supporter of the Vermont senator throughout the primary campaign, often tweeting and blogging about the candidate. He has said that Sanders is "the best candidate for the system we need."

Reich has, however, expressed plans to support Democratic frontrunner Hillary Clinton should she clinch the nomination. According to the professor, a Donald Trump presidency would be ultimately disastrous.

"Trump has revealed himself to be a narcissistic, xenophobic, hatemonger who, if elected, would legitimize bigotry, appoint Supreme Court justices with terrible values, and have direct access to the button that could set off a nuclear war," he wrote in a Facebook post.

All three presidential candidates have been barnstorming in the Bay Area over the last few weeks. Clinton has held several organizing events in San Francisco and Oakland with prominent Bay Area Democrats, while Sanders drew a crowd of more than 20,000 during an event at an Oakland church on Monday. Meanwhile, Trump has also pulled large numbers -- and a large number of protesters -- at his Bay Area rallies.