The protest just outside San Francisco occurred Friday, a day after anti-Trump protesters took to the streets in Southern California, blocking traffic and damaging five police cars in Costa Mesa following a speech by the leader in the race for the Republican presidential nomination. Demonstrators at both locations waved Mexican flags, an action meant to counter Trump's hard stance on immigration and disparaging remarks about Mexico. Because of the protest, Trump was rerouted to a back entrance. In Orange County, once a Republican stronghold but now home to a surging Hispanic population, a vocal but peaceful demonstration before a rally and Trump speech turned violent afterward. Dozens of cars — including those of Trump supporters trying to leave — were stuck in the street as several hundred demonstrators blocked the road, waved Mexican flags and posed for selfies in front of lines of riot police.