Since it is clear that the [legislative veto] was not within any of the express constitutional exceptions authorizing one House to act alone, and equally clear that it was an exercise of legislative power, that action was subject to the standards prescribed in Art. I. The bicameral requirement, the Presentment Clauses, the President's veto, and Congress' power to override a veto were intended to erect enduring checks on each Branch and to protect the people from the improvident exercise of power by mandating certain prescribed steps. To preserve those checks, and maintain the separation of powers, the carefully defined limits on the power of each Branch must not be eroded. To accomplish what has been attempted by one House of Congress in this case requires action in conformity with the express procedures of the Constitution's prescription for legislative action: passage by a majority of both Houses and presentment to the President.
The [legislative veto] doubtless has been in many respects a convenient shortcut; the "sharing" with the Executive by Congress of its authority over aliens in this manner is, on its face, an appealing compromise. In purely practical terms, it is obviously easier for action to be taken by one House without submission to the President; but it is crystal clear from the records of the Convention, contemporaneous writings, and debates that the Framers ranked other values higher than efficiency. The records of the Convention and debates in the states preceding ratification underscore the common desire to define and limit the exercise of the newly created federal powers affecting the states and the people. There is unmistakable expression of a determination that legislation by the national Congress be a step-by-step, deliberate and deliberative process.
INS v. Chadha, 462 U.S. 919 (1983)