The chief security officer of the Senate, he preserves order in the chamber & the galleries
In supervising the chamber and galleries, the sergeant at arms ensures that the ... 
the sergeant at arms maintain order in the Senate Chamber, in the lobby,... [DOC] [TLE] Self-Executing Rule - TheCapitol.Net [PAR] The chief security officer of the Senate, the Sergeant at Arms and staff in the office 
help to preserve order in the Senate chamber, the Senate galleries, and the ... of 
the party to which he/she belongs and formally elected by the whole House.