Its argument is that by legislating on immigration Arizona has trespassed on federal authority and violated the supremacy clause of the constitution.

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First, under the Supremacy Clause of the U.S. Constitution, federal law trumped state law.

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Under the Supremacy Clause of the U.S. Constitution, federal statutes trump conflicting state laws.

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Roe v Wade's guarantee of first-trimester abortions remains in effect, and the constitution's supremacy clause ensures that when state and federal laws are in conflict, federal law wins.

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The Leader of the Liberal Democrats, Nick Clegg, writes in the Observer today that Britain needs a written constitution - a document that formally limits the power of politicians and enshrines the supremacy of the citizen.

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Merely by summoning these bodies into being, he has undermined the supremacy of the Westminster Parliament, which many hold to be the one fixed point in Britain's constitution.

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