"The congregation at the Unitarian Universalist Church of Boulder is expected to vote on Sunday on whether to proceed with preparations to outfit itself as a sanctuary for undocumented immigrants seeking to avoid deportation."
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I have never understood the idea that a "church" can be an "off-limits sanctuary" to those seeking to avoid contact and/or arrest by Law Enforcement Agencies.
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This is another example that the "mythical wall" of the "separation of church and state" is just that: A mythical wall that should not exist simply because the "church" wants to "harbor" suspected or known fugitives of The Law. 
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Even if ICE doesn't want to "violate" the "sanctity" of a "church" without a federal warrant signed by a federal judge, that should be easy enough to obtain.....then The Government can start cracking down on these "churches" who aren't "hiding Jews from the Nazis," but are hiding illegal immigrants from The Government.