CUA Law Professor Roger Hartley was quoted on line-item veto legislation in the Washington Post. See below:

Trump has a secret plan to evade the Constitution and create a line-item veto, apparently

By: Aaron Blake
Publisher: The Washington Post
Date: March 26, 2018

. . .
Added Roger Hartley, a constitutional amendment expert at Catholic University: "I could not imagine what 'different ways' he was thinking that are available to the Congress to enact constitutional line-item veto legislation absent a constitutional amendment."
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