INS v. Chadha was a landmark Supreme Court case in 1983 that addressed the constitutionality of the legislative veto, a mechanism allowing Congress to overturn executive actions. The Court ruled that the legislative veto violated the separation of powers principle, as it allowed one house of Congress to unilaterally invalidate decisions made by the executive branch without following the proper bicameral process. This decision reinforced the idea that both branches of government must adhere to established procedures when exercising their powers.
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