Among other things. It's really a choice between the rule of law and anarchy, this issue being the current manifestation of that conflict.
Tuolumne County became the third California county to join the revolt against California’s “sanctuary state” laws on Tuesday, when its board of supervisors unanimously approved a resolution to comply with federal immigration law.
The county resolution followed similar action by Orange County and San Diego County, both of which opposed the state’s “sanctuary” laws, which are designed to shelter illegal aliens, in the weeks following the Department of Justice’s filing of a lawsuit against the state in early March.
More than a dozen local governments, mostly in Southern California, have since joined the fight against the state’s “sanctuary” laws, which has been hailed by President Donald Trump as a “Revolution.”
Tuolumne County is a rural county in the central part of the state and includes part of Yosemite National Park.
I'll add some local info, since I was born in Tuolumne county. It's pronounced "Two-ALL-um-me, or Two-ALL-um-knee, if you say it slow and careful. It's a local Indian word, of course, and the "umne" suffix means "the people," roughly, and the "Toul" is where the people are from. So, the Tuol people. Same with Mokelumne, Cosumnes, etc. And now you know.