A senator can delay or impede a bill by

Tag-Teaming

Explanation:

'Tag-Teaming' a hold requires at least two senators that want to hold the legislation indefinitely. The first senator (anonymously) places a hold on the legislation, and then, before their name is entered into the record, releases the hold. As a result, Senators can effectively wage (or threaten to wage) a filibuster – in effect, insist on extended debate in order to delay or prevent a final vote on most amendments, bills, or other motions.

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