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A call of the roll to establish whether a [[quorum]] is present. If any [[Senator]] "suggest the absence of a quorum," the Presiding Officer must direct the roll to be called. Often, a quorum call is terminated by unanimous consent before completion, which permits the [[United States Senate|Senate]] to use the [[quorum]] call to obtain a brief delay to work out some difficulty or await a Senator's arrival.<ref>[http://www.senate.gov/reference/glossary_term/quorum_call.htm] US Senate Reference</ref>