San Mateo County 18 hours ago Sheriff Christina Corpus seeks investigation into county executive San Mateo County Sheriff Christina Corpus announced Sunday that she has filed a formal complaint against the county’s executive, Mike Callagy, for what she describes as bullying. US & World Videos 2:24 San Mateo County sheriff seeks investigation into county executive 1:37 Sherrif Corpus calls for investigation 0:58 San Mateo County Sheriff to address changes amid leadership shakeup 2:38 Caltrain welcomes all-electric fleet 0:50 San Mateo County assistant sheriff fired