They can and have in the past, and constitutional crises related to it were averted over this through negotiations etc but this was a contributing part to what lead to the Civil War. We are at the end of the day a federation of states, each state is independent and the federal government while stronger than that of the articles of confederation is not almighty.
States by the constitution do indeed have the ability legally to nullify the enforcement of federal laws within their borders, provided such laws are not explicitly within the powers of the federal government within the constitution.
How this is generally worked around is that the fed will withhold monies if the states don’t enforce the laws, but states for the most part can indeed nullify federal laws if they choose to.
“fed will withhold monies “
exactly!!
which is the money of the People of the Several States to begin with!
the Several States should not have to beg to get some back of what their own citizens have sent in . . .
. . . it is OUR MONEY! It is not “federal” money . . .