But President Obama tried to do exactly that in January, 2012, trying to bypass the constitutional requirement for Senate confirmation of principal U.S. officers.

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Although she used to sit on a judicial watchdog body, she denounced it for ignoring a constitutional requirement that all judges be subjected to reassessment in 2010.

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But they say because it originated in the Senate, it violates a constitutional requirement that revenue bills first pass the House, and therefore it couldn't become law in its current form.

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But the Irish constitutional requirement for consent in both jurisdictions raises the intriguing prospect of southern voters disagreeing with their northern cousins should A Nation Once Again turn from an anthem into a realistic prospect.

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However broad the President's authority may be to recognize States and governments of States under the "receive Ambassadors" clause, it is necessarily limited by the specific Constitutional requirement for Senate advice and consent on the making of treaties.

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The stumbling block is a constitutional requirement that changes must be agreed not just by both houses of parliament but also by the legislatures of at least seven of the 10 provinces, representing at least half their total population.

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The only reason the federal income tax is exempt from this requirement is because of a constitutional amendment.

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The requirement that a defendant be given adequate notice of what he is charged with carries constitutional dimensions and the failure to provide that notice violates due process of law.

CNN