Bicameralism
To pass a law, Congress must use bicameralism (passage of a bill by both houses of Congress) followed by presentment to the President for signature or veto.
No Line Item Vetoes
The requirements of bicameralism and presentment mean that Congress cannot give the President a line item veto power—that is, giving the President the power to cancel parts of a bill while approving others is an unconstitutional delegation of legislative power.
No Legislative Vetoes
Congress can’t retain a legislative veto, which is when Congress gives itself the authority to amend or repeal an existing law without undergoing bicameralism and presentment.