A hold alerts party leadership that the senator will object to expedited or unanimous-consent treatment. Leaders often respond by negotiating, postponing action, or deciding whether the matter justifies scarce floor time and a possible cloture process.

The practice magnifies individual-member leverage but remains informal. A hold does not amend the measure, cast a vote, or create a permanent one-person veto. Its practical force depends on the Senate's schedule and the willingness of leaders and other senators to overcome delay.

Distinguish the notice from the procedure it threatens. The hold signals an objection; unanimous consent is the agreement that objection can block; a filibuster is extended obstruction; cloture is the formal route to limit debate.

Video lesson: How a Bill Becomes a Law: Crash Course Government and Politics #9