What controversial tactic can a President use to let a bill die without vetoing it directly?

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A pocket veto is a tactic to let a bill die without directly vetoing it. Normally, if Congress sends a bill to the President and he or she takes no action for ten days, the bill automatically becomes law. However, if the Congressional session ends before the ten days are up and the President has not signed the bill, it is effectively dead. Since the bill was not actually vetoed, it is not possible to override the veto. Congress can then start the process over from scratch.

What Controversial Tactic Can a President Use to Let a Bill