Rule 5.5.  Quorum call

A. A quorum call to ascertain whether or not a quorum is present shall be in order at any time except when a member has the floor.

B. When a member of the Senate requests a quorum call, the  President shall direct the Secretary to open the voting machine for a roll call. If a majority of the Senators answer the roll call, a quorum shall be deemed to be present. The same roll call procedure, to determine the presence of a quorum, shall be followed as the first order of business in the Morning Hour.