Three Democrats and one Republican clashed Monday on the debate stage as the race for California's U.S. Senate seat heats up. Rep. Adam Schiff, Rep. Katie Porter, REp. Barbara Lee and ex-baseball player Steve Garvey made their case to fill a rare vacancy, for the seat once held by late U.S. Senator Dianne Feinstein. Subscribe to KTVU's YouTube channel: https://www.youtube.com/channel/UCVhtkN7-c8mA8GXEoxS4YQw?sub_confirmation=1 KTVU delivers the best in-depth reports, interviews and breaking news coverage in the San Francisco Bay Area and California Watch KTVU's newscasts on https://www.ktvu.com/live Download KTVU's news and weather apps for free at https://www.ktvu.com/mobile-apps Subscribe to KTVU's newsletter at https://www.ktvu.com/newsletters Follow KTVU on Facebook: https://www.facebook.com/ktvu Follow KTVU on Twitter: https://twitter.com/KTVU Follow KTVU on Instagram: https://www.instagram.com/ktvu2/