"Like many California cities, Oakland has declared itself a sanctuary for those here illegally, and officials there have vowed to fight President Trump's promised immigration crackdown. Tensions have heightened in recent weeks as administration officials have talked about targeting California for increased immigration enforcement. Trump last week also said he was thinking of withdrawing Immigration and Customs Enforcement agents from the state, predicting it could cause a wave of crime.
While Schaaf said she was trying to help those who might be arrested, some advocates said it had a different impact.
"The main reaction that people have had has been fear, unfortunately," said Eleni Wolfe, immigration program director at Centro Legal de la Raza, an Oakland-based advocacy group. "It's terrifying to hear about the potential of increased enforcement action, and unfortunately that's the main message that they heard."
Across California, leaders said they find themselves in a difficult position as they fight federal law enforcement actions. Typically, they said, local and federal officials work in concert. But on immigration, they are at odds." LA Times
"Nullification, in United States constitutional history, is a legal theory that a state has the right to nullify, or invalidate, any federal law which that state has deemed unconstitutional. The theory of nullification has never been legally upheld by federal courts." wiki
"Interposition is a claimed right of a U.S. state to oppose actions of the federal government that the state deems unconstitutional. Under the theory of interposition, a state assumes the right to "interpose" itself between the federal government and the people of the state by taking action to prevent the federal government from enforcing laws that the state considers unconstitutional. In Cooper v. Aaron, 35potential rebels in California are walking a fine line ad8 U.S. 1 (1958), the Supreme Court of the United States rejected interposition explicitly. The Supreme Court and the lower federal courts have consistently held that the power to declare federal laws unconstitutional lies with the federal judiciary, not with the states. The courts have held that interposition is not a valid constitutional doctrine when invoked to block enforcement of federal law." wiki
The leftist politicians who run California are playing with fire. The US is not Canada where N&I or outright secession would probably be met with hand-wringing and not much else. We fought our biggest and most destructive war over these issues and they were largely settled by force majeur. The potential rebels in the Golden State are betting on their ability to frustrate enforcement of federal immigration law by avoiding direct statements of defiance or orders to local government to physically resist arrests and deportation.
IMO this game can only be played so long as the federal government allows it. If that forbearance ends then they could easily be declared to be guilty of criminal acts. pl